mirror of
git://git.gnupg.org/gnupg.git
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98ef43987a
warnings are not intended to be the be-all and end-all in security checks. Add note to --group that when used on the command line, it may be necessary to quote the argument so it is not treated as multiple arguments. Noted by Stefan Bellon.
2638 lines
85 KiB
Plaintext
2638 lines
85 KiB
Plaintext
<!-- gpg.sgml - the man page for GnuPG
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Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of GnuPG.
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GnuPG is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GnuPG is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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-->
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<!-- This file should be processed by docbook-to-man to
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create a manual page. This program has currently the bug
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not to remove leading white space. So this source file does
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not look very pretty
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FIXME: generated a file with entity (e.g. pathnames) from the
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configure scripts and include it here
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-->
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<!DOCTYPE refentry PUBLIC "-//Davenport//DTD DocBook V3.0//EN" [
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<!entity ParmDir "<parameter>directory</parameter>">
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<!entity ParmFile "<parameter>file</parameter>">
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<!entity OptParmFile "<optional>&ParmFile;</optional>">
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<!entity ParmFiles "<parameter>files</parameter>">
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<!entity OptParmFiles "<optional>&ParmFiles;</optional>">
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<!entity ParmNames "<parameter>names</parameter>">
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<!entity OptParmNames "<optional>&ParmNames;</optional>">
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<!entity ParmName "<parameter>name</parameter>">
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<!entity OptParmName "<optional>&ParmName;</optional>">
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<!entity ParmKeyIDs "<parameter>key IDs</parameter>">
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<!entity ParmN "<parameter>n</parameter>">
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<!entity ParmFlags "<parameter>flags</parameter>">
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<!entity ParmString "<parameter>string</parameter>">
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<!entity ParmValue "<parameter>value</parameter>">
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<!entity ParmNameValue "<parameter>name=value</parameter>">
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<!entity ParmNameValues "<parameter>name=value1 <optional>value2 value3 ...</optional></parameter>">
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]>
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<refentry id="gpg">
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<refmeta>
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<refentrytitle>gpg</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo class="gnu">GNU Tools</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname/gpg/
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<refpurpose>encryption and signing tool</>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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<command>gpg</>
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<optional>--homedir <parameter/name/</optional>
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<optional>--options <parameter/file/</optional>
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<optional><parameter/options/</optional>
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<parameter>command</>
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<optional><parameter/args/</optional>
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>DESCRIPTION</title>
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<para>
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<command/gpg/ is the main program for the GnuPG system.
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</para>
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<para>
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This man page only lists the commands and options available.
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For more verbose documentation get the GNU Privacy Handbook (GPH) or
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one of the other documents at http://www.gnupg.org/docs.html .
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</para>
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<para>
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Please remember that option parsing stops as soon as a non option is
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encountered, you can explicitly stop option parsing by using the
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special option "--".
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</para>
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</refsect1>
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<refsect1>
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<title>COMMANDS</title>
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<para>
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<command/gpg/ recognizes these commands:
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</para>
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<variablelist>
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<varlistentry>
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<term>-s, --sign</term>
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<listitem><para>
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Make a signature. This command may be combined
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with --encrypt.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--clearsign</term>
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<listitem><para>
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Make a clear text signature.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>-b, --detach-sign</term>
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<listitem><para>
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Make a detached signature.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>-e, --encrypt</term>
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<listitem><para>
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Encrypt data. This option may be combined with --sign.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>-c, --symmetric</term>
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<listitem><para>
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Encrypt with symmetric cipher only.
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This command asks for a passphrase.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--store</term>
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<listitem><para>
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Store only (make a simple RFC1991 packet).
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--decrypt &OptParmFile;</term>
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<listitem><para>
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Decrypt &ParmFile; (or stdin if no file is specified) and
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write it to stdout (or the file specified with
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--output). If the decrypted file is signed, the
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signature is also verified. This command differs
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from the default operation, as it never writes to the
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filename which is included in the file and it
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rejects files which don't begin with an encrypted
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message.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--verify <optional><optional><parameter/sigfile/</optional>
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<optional><parameter/signed-files/</optional></optional></term>
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<listitem><para>
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Assume that <parameter/sigfile/ is a signature and verify it
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without generating any output. With no arguments,
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the signature packet is read from stdin. If
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only a sigfile is given, it may be a complete
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signature or a detached signature, in which case
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the signed stuff is expected in a file without the
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".sig" or ".asc" extension.
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With more than
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1 argument, the first should be a detached signature
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and the remaining files are the signed stuff. To read the signed
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stuff from stdin, use <literal>-</literal> as the second filename.
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For security reasons a detached signature cannot read the signed
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material from stdin without denoting it in the above way.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--verify-files <optional><parameter/files/</optional></term>
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<listitem><para>
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This is a special version of the --verify command which does not work with
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detached signatures. The command expects the files to be verified either
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on the command line or reads the filenames from stdin; each name must be on
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separate line. The command is intended for quick checking of many files.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--encrypt-files <optional><parameter/files/</optional></term>
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<listitem><para>
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This is a special version of the --encrypt command. The command expects
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the files to be encrypted either on the command line or reads the filenames
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from stdin; each name must be on separate line. The command is intended
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for a quick encryption of multiple files.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--decrypt-files <optional><parameter/files/</optional></term>
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<listitem><para>
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The same as --encrypt-files with the difference that files will be
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decrypted. The syntax or the filenames is the same.
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</para></listitem></varlistentry>
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<!--
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B<-k> [I<username>] [I<keyring>]
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Kludge to be somewhat compatible with PGP.
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Without arguments, all public keyrings are listed.
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With one argument, only I<keyring> is listed.
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Special combinations are also allowed, but they may
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give strange results when combined with more options.
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B<-kv> Same as B<-k>
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B<-kvv> List the signatures with every key.
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B<-kvvv> Additionally check all signatures.
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B<-kvc> List fingerprints
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B<-kvvc> List fingerprints and signatures
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B<This command may be removed in the future!>
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-->
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<varlistentry>
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<term>--list-keys &OptParmNames;</term>
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<term>--list-public-keys &OptParmNames;</term>
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<listitem><para>
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List all keys from the public keyrings, or just the
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ones given on the command line.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--list-secret-keys &OptParmNames;</term>
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<listitem><para>
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List all keys from the secret keyrings, or just the ones given on the
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command line. A '#' after the letters 'sec' means that the secret key
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is not usable (for example, if it was created via
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--export-secret-subkeys).
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--list-sigs &OptParmNames;</term>
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<listitem><para>
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Same as --list-keys, but the signatures are listed too.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--check-sigs &OptParmNames;</term>
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<listitem><para>
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Same as --list-sigs, but the signatures are verified.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--fingerprint &OptParmNames;</term>
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<listitem><para>
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List all keys with their fingerprints. This is the
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same output as --list-keys but with the additional output
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of a line with the fingerprint. May also be combined
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with --list-sigs or --check-sigs.
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If this command is given twice, the fingerprints of all
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secondary keys are listed too.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--list-packets</term>
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<listitem><para>
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List only the sequence of packets. This is mainly
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useful for debugging.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--gen-key</term>
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<listitem><para>
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Generate a new key pair. This command is normally only used
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interactively.
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</para>
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<para>
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There is an experimental feature which allows you to create keys
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in batch mode. See the file <filename>doc/DETAILS</filename>
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in the source distribution on how to use this.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>--edit-key &ParmName;</term>
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<listitem><para>
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Present a menu which enables you to do all key
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related tasks:</para>
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<variablelist>
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<varlistentry>
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<term>sign</term>
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<listitem><para>
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Make a signature on key of user &ParmName;
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If the key is not yet signed by the default
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user (or the users given with -u), the
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program displays the information of the key
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again, together with its fingerprint and
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asks whether it should be signed. This
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question is repeated for all users specified
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with -u.</para></listitem></varlistentry>
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<varlistentry>
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<term>lsign</term>
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<listitem><para>
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Same as --sign but the signature is marked as
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non-exportable and will therefore never be used
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by others. This may be used to make keys valid
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only in the local environment.</para></listitem></varlistentry>
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<varlistentry>
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<term>nrsign</term>
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<listitem><para>
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Same as --sign but the signature is marked as non-revocable and can
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therefore never be revoked.</para></listitem></varlistentry>
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<varlistentry>
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<term>nrlsign</term>
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<listitem><para>
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Combines the functionality of nrsign and lsign to make a signature
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that is both non-revocable and
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non-exportable.</para></listitem></varlistentry>
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<varlistentry>
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<term>tsign</term>
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<listitem><para>
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Make a trust signature. This is a signature that combines the notions
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of certification (like a regular signature), and trust (like the
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"trust" command). It is generally only useful in distinct communities
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or groups.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>revsig</term>
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<listitem><para>
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Revoke a signature. For every signature which has been generated by
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one of the secret keys, GnuPG asks whether a revocation certificate
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should be generated.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>trust</term>
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<listitem><para>
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Change the owner trust value. This updates the
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trust-db immediately and no save is required.</para></listitem></varlistentry>
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<varlistentry>
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<term>disable</term>
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<term>enable</term>
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<listitem><para>
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Disable or enable an entire key. A disabled key can normally not be used
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for encryption.</para></listitem></varlistentry>
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<varlistentry>
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<term>adduid</term>
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<listitem><para>
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Create an alternate user id.</para></listitem></varlistentry>
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<varlistentry>
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<term>addphoto</term>
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<listitem><para>
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Create a photographic user id.</para></listitem></varlistentry>
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<varlistentry>
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<term>deluid</term>
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<listitem><para>
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Delete a user id.</para></listitem></varlistentry>
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<varlistentry>
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<term>addkey</term>
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<listitem><para>
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Add a subkey to this key.</para></listitem></varlistentry>
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<varlistentry>
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<term>delkey</term>
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<listitem><para>
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Remove a subkey.</para></listitem></varlistentry>
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<varlistentry>
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<term>addrevoker</term>
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<listitem><para>
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Add a designated revoker. This takes one optional argument:
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"sensitive". If a designated revoker is marked as sensitive, it will
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not be exported by default (see
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export-options).</para></listitem></varlistentry>
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<varlistentry>
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<term>revkey</term>
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<listitem><para>
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Revoke a subkey.</para></listitem></varlistentry>
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<varlistentry>
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<term>expire</term>
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<listitem><para>
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Change the key expiration time. If a subkey is selected, the
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expiration time of this subkey will be changed. With no selection,
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the key expiration of the primary key is changed.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>passwd</term>
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<listitem><para>
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Change the passphrase of the secret key.</para></listitem></varlistentry>
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<varlistentry>
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<term>primary</term>
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<listitem><para>
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Flag the current user id as the primary one, removes the primary user
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id flag from all other user ids and sets the timestamp of all affected
|
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self-signatures one second ahead. Note that setting a photo user ID
|
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as primary makes it primary over other photo user IDs, and setting a
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regular user ID as primary makes it primary over other regular user
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IDs.
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</para></listitem></varlistentry>
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<varlistentry>
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<term>uid &ParmN;</term>
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<listitem><para>
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Toggle selection of user id with index &ParmN;.
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Use 0 to deselect all.</para></listitem></varlistentry>
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<varlistentry>
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<term>key &ParmN;</term>
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<listitem><para>
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Toggle selection of subkey with index &ParmN;.
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Use 0 to deselect all.</para></listitem></varlistentry>
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<varlistentry>
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<term>check</term>
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<listitem><para>
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Check all selected user ids.</para></listitem></varlistentry>
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<varlistentry>
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<term>showphoto</term>
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<listitem><para>
|
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Display the selected photographic user
|
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id.</para></listitem></varlistentry>
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<varlistentry>
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<term>pref</term>
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<listitem><para>
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|
List preferences from the selected user ID. This shows the actual
|
|
preferences, without including any implied preferences.
|
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</para></listitem></varlistentry>
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<varlistentry>
|
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<term>showpref</term>
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<listitem><para>
|
|
More verbose preferences listing for the selected user ID. This shows
|
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the preferences in effect by including the implied preferences of
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3DES (cipher), SHA-1 (digest), and Uncompressed (compression) if they
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are not already included in the preference list.
|
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</para></listitem></varlistentry>
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<varlistentry>
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<term>setpref &ParmString;</term>
|
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<listitem><para>
|
|
Set the list of user ID preferences to &ParmString;, this should be a
|
|
string similar to the one printed by "pref". Using an empty string
|
|
will set the default preference string, using "none" will set the
|
|
preferences to nil. Use "gpg --version" to get a list of available
|
|
algorithms. This command just initializes an internal list and does
|
|
not change anything unless another command (such as "updpref") which
|
|
changes the self-signatures is used.
|
|
</para></listitem></varlistentry>
|
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<varlistentry>
|
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<term>updpref</term>
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<listitem><para>
|
|
Change the preferences of all user IDs (or just of the selected ones
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|
to the current list of preferences. The timestamp of all affected
|
|
self-signatures will be advanced by one second. Note that while you
|
|
can change the preferences on an attribute user ID (aka "photo ID"),
|
|
GnuPG does not select keys via attribute user IDs so these preferences
|
|
will not be used by GnuPG.
|
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</para></listitem></varlistentry>
|
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<varlistentry>
|
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<term>toggle</term>
|
|
<listitem><para>
|
|
Toggle between public and secret key listing.</para></listitem></varlistentry>
|
|
<varlistentry>
|
|
<term>save</term>
|
|
<listitem><para>
|
|
Save all changes to the key rings and quit.</para></listitem></varlistentry>
|
|
<varlistentry>
|
|
<term>quit</term>
|
|
<listitem><para>
|
|
Quit the program without updating the
|
|
key rings.</para></listitem></varlistentry>
|
|
</variablelist>
|
|
<para>
|
|
The listing shows you the key with its secondary
|
|
keys and all user ids. Selected keys or user ids
|
|
are indicated by an asterisk. The trust value is
|
|
displayed with the primary key: the first is the
|
|
assigned owner trust and the second is the calculated
|
|
trust value. Letters are used for the values:</para>
|
|
<variablelist>
|
|
<varlistentry><term>-</term><listitem><para>No ownertrust assigned / not yet calculated.</para></listitem></varlistentry>
|
|
<varlistentry><term>e</term><listitem><para>Trust
|
|
calculation has failed; probably due to an expired key.</para></listitem></varlistentry>
|
|
<varlistentry><term>q</term><listitem><para>Not enough information for calculation.</para></listitem></varlistentry>
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<varlistentry><term>n</term><listitem><para>Never trust this key.</para></listitem></varlistentry>
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<varlistentry><term>m</term><listitem><para>Marginally trusted.</para></listitem></varlistentry>
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<varlistentry><term>f</term><listitem><para>Fully trusted.</para></listitem></varlistentry>
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|
<varlistentry><term>u</term><listitem><para>Ultimately trusted.</para></listitem></varlistentry>
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|
</variablelist>
|
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</listitem></varlistentry>
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|
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<varlistentry>
|
|
<term>--sign-key &ParmName;</term>
|
|
<listitem><para>
|
|
Signs a public key with your secret key. This is a shortcut version of
|
|
the subcommand "sign" from --edit.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--lsign-key &ParmName;</term>
|
|
<listitem><para>
|
|
Signs a public key with your secret key but marks it as
|
|
non-exportable. This is a shortcut version of the subcommand "lsign"
|
|
from --edit.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--nrsign-key &ParmName;</term>
|
|
<listitem><para>
|
|
Signs a public key with your secret key but marks it as non-revocable.
|
|
This is a shortcut version of the subcommand "nrsign" from --edit.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--delete-key &ParmName;</term>
|
|
<listitem><para>
|
|
Remove key from the public keyring. In batch mode either --yes is
|
|
required or the key must be specified by fingerprint. This is a
|
|
safeguard against accidental deletion of multiple keys.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--delete-secret-key &ParmName;</term>
|
|
<listitem><para>
|
|
Remove key from the secret and public keyring. In batch mode the key
|
|
must be specified by fingerprint.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--delete-secret-and-public-key &ParmName;</term>
|
|
<listitem><para>
|
|
Same as --delete-key, but if a secret key exists, it will be removed
|
|
first. In batch mode the key must be specified by fingerprint.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--gen-revoke</term>
|
|
<listitem><para>
|
|
Generate a revocation certificate for the complete key. To revoke
|
|
a subkey or a signature, use the --edit command.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--desig-revoke</term>
|
|
<listitem><para>
|
|
Generate a designated revocation certificate for a key. This allows a
|
|
user (with the permission of the keyholder) to revoke someone elses
|
|
key.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--export &OptParmNames;</term>
|
|
<listitem><para>
|
|
Either export all keys from all keyrings (default
|
|
keyrings and those registered via option --keyring),
|
|
or if at least one name is given, those of the given
|
|
name. The new keyring is written to stdout or to
|
|
the file given with option "output". Use together
|
|
with --armor to mail those keys.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--send-keys &OptParmNames;</term>
|
|
<listitem><para>
|
|
Same as --export but sends the keys to a keyserver.
|
|
Option --keyserver must be used to give the name
|
|
of this keyserver. Don't send your complete keyring
|
|
to a keyserver - select only those keys which are new
|
|
or changed by you.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--export-all &OptParmNames;</term>
|
|
<listitem><para>
|
|
Same as --export, but also exports keys which
|
|
are not compatible with OpenPGP.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--export-secret-keys &OptParmNames;</term>
|
|
<term>--export-secret-subkeys &OptParmNames;</term>
|
|
<listitem><para>
|
|
Same as --export, but exports the secret keys instead.
|
|
This is normally not very useful and a security risk.
|
|
The second form of the command has the special property to
|
|
render the secret part of the primary key useless; this is
|
|
a GNU extension to OpenPGP and other implementations can
|
|
not be expected to successfully import such a key.
|
|
|
|
See the option --simple-sk-checksum if you want to import such an
|
|
exported key with an older OpenPGP implementation.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--import &OptParmFiles;</term>
|
|
<term>--fast-import &OptParmFiles;</term>
|
|
<listitem><para>
|
|
Import/merge keys. This adds the given keys to the
|
|
keyring. The fast version is currently just a synonym.
|
|
</para>
|
|
<para>
|
|
There are a few other options which control how this command works.
|
|
Most notable here is the --merge-only option which does not insert new keys
|
|
but does only the merging of new signatures, user-IDs and subkeys.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--recv-keys &ParmKeyIDs;</term>
|
|
<listitem><para>
|
|
Import the keys with the given key IDs from a keyserver. Option
|
|
--keyserver must be used to give the name of this keyserver.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--refresh-keys &ParmKeyIDs;</term>
|
|
<listitem><para>
|
|
Request updates from a keyserver for keys that already exist on the
|
|
local keyring. This is useful for updating a key with the latest
|
|
signatures, user IDs, etc. Option --keyserver must be used to give
|
|
the name of this keyserver.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--search-keys &OptParmNames;</term>
|
|
<listitem><para>
|
|
Search the keyserver for the given names. Multiple names given here
|
|
will be joined together to create the search string for the keyserver.
|
|
Option --keyserver must be used to give the name of this keyserver.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--update-trustdb</term>
|
|
<listitem><para>
|
|
Do trust DB maintenance. This command goes over all keys and builds
|
|
the Web-of-Trust. This is an interactive command because it may has to
|
|
ask for the "ownertrust" values of keys. The user has to give an
|
|
estimation in how far she trusts the owner of the displayed key to
|
|
correctly certify (sign) other keys. It does only ask for that value
|
|
if it has not yet been assigned to a key. Using the edit menu, that
|
|
value can be changed at any time later.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--check-trustdb</term>
|
|
<listitem><para>
|
|
Do trust DB maintenance without user interaction. Form time to time
|
|
the trust database must be updated so that expired keys and resulting
|
|
changes in the Web-of-Trust can be tracked. GnuPG tries to figure
|
|
when this is required and then does it implicitly; this command can be
|
|
used to force such a check. The processing is identically to that of
|
|
--update-trustdb but it skips keys with a not yet defined "ownertrust".
|
|
</para>
|
|
<para>
|
|
For use with cron jobs, this command can be used together with --batch
|
|
in which case the check is only done when it is due. To force a run
|
|
even in batch mode add the option --yes.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--export-ownertrust &OptParmFile;</term>
|
|
<listitem><para>
|
|
Store the ownertrust values into
|
|
&ParmFile; (or stdin if not given). This is useful for backup
|
|
purposes as these values are the only ones which can't be re-created
|
|
from a corrupted trust DB.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--import-ownertrust &OptParmFiles;</term>
|
|
<listitem><para>
|
|
Update the trustdb with the ownertrust values stored
|
|
in &ParmFiles; (or stdin if not given); existing
|
|
values will be overwritten.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--rebuild-keydb-caches</term>
|
|
<listitem><para>
|
|
When updating from version 1.0.6 to 1.0.7 this command should be used
|
|
to create signature caches in the keyring. It might be handy in other
|
|
situations too.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--print-md <parameter>algo</parameter> &OptParmFiles;</term>
|
|
<term>--print-mds &OptParmFiles;</term>
|
|
<listitem><para>
|
|
Print message digest of algorithm ALGO for all given files or stdin.
|
|
With the second form (or a deprecated "*" as algo) digests for all
|
|
available algorithms are printed.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--gen-random <parameter>0|1|2</parameter>
|
|
<optional><parameter>count</parameter></optional></term>
|
|
<listitem><para>
|
|
Emit COUNT random bytes of the given quality level. If count is not given
|
|
or zero, an endless sequence of random bytes will be emitted.
|
|
PLEASE, don't use this command unless you know what you are doing; it may
|
|
remove precious entropy from the system!
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--gen-prime <parameter>mode</parameter>
|
|
<parameter>bits</parameter>
|
|
<optional><parameter>qbits</parameter></optional></term>
|
|
<listitem><para>
|
|
Use the source, Luke :-). The output format is still subject to change.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--version</term>
|
|
<listitem><para>
|
|
Print version information along with a list
|
|
of supported algorithms.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--warranty</term>
|
|
<listitem><para>
|
|
Print warranty information.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-h, --help</term>
|
|
<listitem><para>
|
|
Print usage information. This is a really long list even though it doesn't list
|
|
all options.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>OPTIONS</title>
|
|
<para>
|
|
Long options can be put in an options file (default
|
|
"~/.gnupg/gpg.conf"). Short option names will not work - for example,
|
|
"armor" is a valid option for the options file, while "a" is not. Do
|
|
not write the 2 dashes, but simply the name of the option and any
|
|
required arguments. Lines with a hash ('#') as the first
|
|
non-white-space character are ignored. Commands may be put in this
|
|
file too, but that does not make sense.
|
|
</para>
|
|
<para>
|
|
<command/gpg/ recognizes these options:
|
|
</para>
|
|
|
|
<variablelist>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-a, --armor</term>
|
|
<listitem><para>
|
|
Create ASCII armored output.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-o, --output &ParmFile;</term>
|
|
<listitem><para>
|
|
Write output to &ParmFile;.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-mangle-dos-filenames</term>
|
|
<term>--mangle-dos-filenames</term>
|
|
<listitem><para>
|
|
The Windows version of GPG replaces the extension of an output
|
|
filename to avoid problems with filenames containing more than one
|
|
dot. This is not necessary for newer Windows version and such
|
|
--no-mangle-dos-filenames can be used to switch this feature off and
|
|
have GPG append the new extension. This otion has no effect on
|
|
non-windows platforms.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
|
|
<varlistentry>
|
|
<term>-u, --local-user &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName as the user ID to sign.
|
|
This option is silently ignored for the list commands,
|
|
so that it can be used in an options file.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--default-key &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName; as default user ID for signatures. If this
|
|
is not used the default user ID is the first user ID
|
|
found in the secret keyring.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-r, --recipient &ParmName;</term>
|
|
<term></term>
|
|
<listitem><para>
|
|
Encrypt for user id &ParmName;. If this option or --hidden-recipient
|
|
is not specified, GnuPG asks for the user-id unless
|
|
--default-recipient is given.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>-R, --hidden-recipient &ParmName;</term>
|
|
<term></term>
|
|
<listitem><para>
|
|
Encrypt for user id &ParmName;, but hide the keyid of the key. This
|
|
option hides the receiver of the message and is a countermeasure
|
|
against traffic analysis. If this option or --recipient is not
|
|
specified, GnuPG asks for the user-id unless --default-recipient is
|
|
given.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--default-recipient &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName; as default recipient if option --recipient is not used and
|
|
don't ask if this is a valid one. &ParmName; must be non-empty.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--default-recipient-self</term>
|
|
<listitem><para>
|
|
Use the default key as default recipient if option --recipient is not used and
|
|
don't ask if this is a valid one. The default key is the first one from the
|
|
secret keyring or the one set with --default-key.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no-default-recipient</term>
|
|
<listitem><para>
|
|
Reset --default-recipient and --default-recipient-self.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--encrypt-to &ParmName;</term>
|
|
<listitem><para>
|
|
Same as --recipient but this one is intended for use
|
|
in the options file and may be used with
|
|
your own user-id as an "encrypt-to-self". These keys
|
|
are only used when there are other recipients given
|
|
either by use of --recipient or by the asked user id.
|
|
No trust checking is performed for these user ids and
|
|
even disabled keys can be used.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--hidden-encrypt-to &ParmName;</term>
|
|
<listitem><para>
|
|
Same as --hidden-recipient but this one is intended for use in the
|
|
options file and may be used with your own user-id as a hidden
|
|
"encrypt-to-self". These keys are only used when there are other
|
|
recipients given either by use of --recipient or by the asked user id.
|
|
No trust checking is performed for these user ids and even disabled
|
|
keys can be used.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-encrypt-to</term>
|
|
<listitem><para>
|
|
Disable the use of all --encrypt-to and --hidden-encrypt-to keys.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-v, --verbose</term>
|
|
<listitem><para>
|
|
Give more information during processing. If used
|
|
twice, the input data is listed in detail.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-q, --quiet</term>
|
|
<listitem><para>
|
|
Try to be as quiet as possible.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-z &ParmN;, --compress &ParmN;</term>
|
|
<listitem><para>
|
|
Set compression level to &ParmN;. A value of 0 for &ParmN;
|
|
disables compression. Default is to use the default
|
|
compression level of zlib (normally 6).
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-t, --textmode</term>
|
|
<listitem><para>
|
|
Use canonical text mode. If -t (but not
|
|
--textmode) is used together with armoring
|
|
and signing, this enables clearsigned messages.
|
|
This kludge is needed for PGP compatibility;
|
|
normally you would use --sign or --clearsign
|
|
to selected the type of the signature.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-n, --dry-run</term>
|
|
<listitem><para>
|
|
Don't make any changes (this is not completely implemented).
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>-i, --interactive</term>
|
|
<listitem><para>
|
|
Prompt before overwriting any files.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--batch</term>
|
|
<listitem><para>
|
|
Use batch mode. Never ask, do not allow interactive
|
|
commands.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-tty</term>
|
|
<listitem><para>
|
|
Make sure that the TTY (terminal) is never used for any output.
|
|
This option is needed in some cases because GnuPG sometimes prints
|
|
warnings to the TTY if --batch is used.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no-batch</term>
|
|
<listitem><para>
|
|
Disable batch mode. This may be of use if --batch
|
|
is enabled from an options file.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--yes</term>
|
|
<listitem><para>
|
|
Assume "yes" on most questions.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no</term>
|
|
<listitem><para>
|
|
Assume "no" on most questions.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--default-cert-check-level &ParmN;</term>
|
|
<listitem><para>
|
|
The default to use for the check level when signing a key.
|
|
</para><para>
|
|
0 means you make no particular claim as to how carefully you verified
|
|
the key.
|
|
</para><para>
|
|
1 means you believe the key is owned by the person who claims to own
|
|
it but you could not, or did not verify the key at all. This is
|
|
useful for a "persona" verification, where you sign the key of a
|
|
pseudonymous user.
|
|
</para><para>
|
|
2 means you did casual verification of the key. For example, this
|
|
could mean that you verified that the key fingerprint and checked the
|
|
user ID on the key against a photo ID.
|
|
</para><para>
|
|
3 means you did extensive verification of the key. For example, this
|
|
could mean that you verified the key fingerprint with the owner of the
|
|
key in person, and that you checked, by means of a hard to forge
|
|
document with a photo ID (such as a passport) that the name of the key
|
|
owner matches the name in the user ID on the key, and finally that you
|
|
verified (by exchange of email) that the email address on the key
|
|
belongs to the key owner.
|
|
</para><para>
|
|
Note that the examples given above for levels 2 and 3 are just that:
|
|
examples. In the end, it is up to you to decide just what "casual"
|
|
and "extensive" mean to you.
|
|
</para><para>
|
|
This option defaults to 0.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
|
|
<varlistentry>
|
|
<term>--trusted-key <parameter>long key ID</parameter></term>
|
|
<listitem><para>
|
|
Assume that the specified key (which must be given
|
|
as a full 8 byte key ID) is as trustworthy as one of
|
|
your own secret keys. This option is useful if you
|
|
don't want to keep your secret keys (or one of them)
|
|
online but still want to be able to check the validity of a given
|
|
recipient's or signator's key.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--trust-model <parameter>openpgp|classic|always</parameter></term>
|
|
<listitem><para>
|
|
|
|
Set what trust model GnuPG should follow. The models are:
|
|
|
|
<variablelist>
|
|
|
|
<varlistentry><term>openpgp</term><listitem><para>
|
|
This is the web-of-trust combined with trust signatures as used in PGP
|
|
5.x and later. This is the default trust model.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry><term>classic</term><listitem><para>
|
|
This is the standard web-of-trust as used in PGP 2.x and earlier.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry><term>always</term><listitem><para>
|
|
Skip key validation and assume that used keys are always fully
|
|
trusted. You won't use this unless you have installed some external
|
|
validation scheme. This option also suppresses the "[uncertain]" tag
|
|
printed with signature checks when there is no evidence that the user
|
|
ID is bound to the key.
|
|
</para></listitem></varlistentry>
|
|
|
|
</variablelist></para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--always-trust</term>
|
|
<listitem><para>
|
|
Identical to `--trust-model always'
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--keyserver &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName as your keyserver. This is the server that --recv-keys,
|
|
--send-keys, and --search-keys will communicate with to receive keys
|
|
from, send keys to, and search for keys on. The format of the
|
|
&ParmName is a URI: `scheme:[//]keyservername[:port]' The scheme is
|
|
the type of keyserver: "hkp" for the Horowitz (or compatible)
|
|
keyservers, "ldap" for the NAI LDAP keyserver, or "mailto" for the
|
|
Horowitz email keyserver. Note that your particular installation of
|
|
GnuPG may have other keyserver types available as well. Keyserver
|
|
schemes are case-insensitive.
|
|
</para><para>
|
|
Most keyservers synchronize with each other, so there is generally no
|
|
need to send keys to more than one server. Using the command "host -l
|
|
pgp.net | grep wwwkeys" gives you a list of HKP keyservers. When
|
|
using one of the wwwkeys servers, due to load balancing using
|
|
round-robin DNS you may notice that you get a different key server
|
|
each time.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--keyserver-options <parameter>parameters</parameter></term>
|
|
<listitem><para>
|
|
This is a space or comma delimited string that gives options for the
|
|
keyserver. Options can be prepended with a `no-' to give the opposite
|
|
meaning. Valid import-options or export-options may be used here as
|
|
well to apply to importing (--recv-key) or exporting (--send-key) a
|
|
key from a keyserver. While not all options are available for all
|
|
keyserver types, some common options are:
|
|
<variablelist>
|
|
|
|
<varlistentry>
|
|
<term>include-revoked</term>
|
|
<listitem><para>
|
|
When searching for a key with --search-keys, include keys that are
|
|
marked on the keyserver as revoked. Note that this option is always
|
|
set when using the NAI HKP keyserver, as this keyserver does not
|
|
differentiate between revoked and unrevoked keys.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>include-disabled</term>
|
|
<listitem><para>
|
|
When searching for a key with --search-keys, include keys that are
|
|
marked on the keyserver as disabled. Note that this option is not
|
|
used with HKP keyservers.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>include-subkeys</term>
|
|
<listitem><para>
|
|
When receiving a key, include subkeys as potential targets. Note that
|
|
this option is not used with HKP keyservers, as they do not support
|
|
retrieving keys by subkey id.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>use-temp-files</term>
|
|
<listitem><para>
|
|
On most Unix-like platforms, GnuPG communicates with the keyserver
|
|
helper program via pipes, which is the most efficient method. This
|
|
option forces GnuPG to use temporary files to communicate. On some
|
|
platforms (such as Win32 and RISC OS), this option is always enabled.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>keep-temp-files</term>
|
|
<listitem><para>
|
|
If using `use-temp-files', do not delete the temp files after using
|
|
them. This option is useful to learn the keyserver communication
|
|
protocol by reading the temporary files.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>verbose</term>
|
|
<listitem><para>
|
|
Tell the keyserver helper program to be more verbose. This option can
|
|
be repeated multiple times to increase the verbosity level.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>honor-http-proxy</term>
|
|
<listitem><para>
|
|
For keyserver schemes that use HTTP (such as HKP), try to access the
|
|
keyserver over the proxy set with the environment variable
|
|
"http_proxy".
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>auto-key-retrieve</term>
|
|
<listitem><para>
|
|
This option enables the automatic retrieving of keys from a keyserver
|
|
when verifying signatures made by keys that are not on the local
|
|
keyring.
|
|
</para></listitem></varlistentry>
|
|
|
|
</variablelist>
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--import-options <parameter>parameters</parameter></term>
|
|
<listitem><para>
|
|
This is a space or comma delimited string that gives options for
|
|
importing keys. Options can be prepended with a `no-' to give the
|
|
opposite meaning. The options are:
|
|
<variablelist>
|
|
|
|
<varlistentry>
|
|
<term>allow-local-sigs</term>
|
|
<listitem><para>
|
|
Allow importing key signatures marked as "local". This is not
|
|
generally useful unless a shared keyring scheme is being used.
|
|
Defaults to no.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>repair-hkp-subkey-bug</term>
|
|
<listitem><para>
|
|
During import, attempt to repair the HKP keyserver mangling multiple
|
|
subkeys bug. Note that this cannot completely repair the damaged key
|
|
as some crucial data is removed by the keyserver, but it does at least
|
|
give you back one subkey. Defaults to no for regular --import and to
|
|
yes for keyserver --recv-keys.
|
|
</para></listitem></varlistentry>
|
|
|
|
</variablelist>
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--export-options <parameter>parameters</parameter></term>
|
|
<listitem><para>
|
|
This is a space or comma delimited string that gives options for
|
|
exporting keys. Options can be prepended with a `no-' to give the
|
|
opposite meaning. The options are:
|
|
<variablelist>
|
|
|
|
<varlistentry>
|
|
<term>include-non-rfc</term>
|
|
<listitem><para>
|
|
Include non-RFC compliant keys in the export. Defaults to yes.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>include-local-sigs</term>
|
|
<listitem><para>
|
|
Allow exporting key signatures marked as "local". This is not
|
|
generally useful unless a shared keyring scheme is being used.
|
|
Defaults to no.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>include-attributes</term>
|
|
<listitem><para>
|
|
Include attribute user IDs (photo IDs) while exporting. This is
|
|
useful to export keys if they are going to be used by an OpenPGP
|
|
program that does not accept attribute user IDs. Defaults to yes.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>include-sensitive-revkeys</term>
|
|
<listitem><para>
|
|
Include designated revoker information that was marked as
|
|
"sensitive". Defaults to no.
|
|
</para></listitem></varlistentry>
|
|
|
|
</variablelist>
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--show-photos</term>
|
|
<listitem><para>
|
|
Causes --list-keys, --list-sigs, --list-public-keys,
|
|
--list-secret-keys, and verifying a signature to also display the
|
|
photo ID attached to the key, if any.
|
|
See also --photo-viewer.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-show-photos</term>
|
|
<listitem><para>
|
|
Resets the --show-photos flag.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--photo-viewer &ParmString;</term>
|
|
<listitem><para>
|
|
This is the command line that should be run to view a photo ID. "%i"
|
|
will be expanded to a filename containing the photo. "%I" does the
|
|
same, except the file will not be deleted once the viewer exits.
|
|
Other flags are "%k" for the key ID, "%K" for the long key ID, "%f"
|
|
for the key fingerprint, "%t" for the extension of the image type
|
|
(e.g. "jpg"), "%T" for the MIME type of the image (e.g. "image/jpeg"),
|
|
and "%%" for an actual percent sign. If neither %i or %I are present,
|
|
then the photo will be supplied to the viewer on standard input.
|
|
</para><para>
|
|
The default viewer is "xloadimage -fork -quiet -title 'KeyID 0x%k'
|
|
stdin"
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--exec-path &ParmString;</term>
|
|
<listitem><para>
|
|
Sets a list of directories to search for photo viewers and keyserver
|
|
helpers. If not provided, keyserver helpers use the compiled-in
|
|
default directory, and photo viewers use the $PATH environment
|
|
variable.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--show-keyring</term>
|
|
<listitem><para>
|
|
Causes --list-keys, --list-public-keys, and --list-secret-keys to
|
|
display the name of the keyring a given key resides on. This is only
|
|
useful when you're listing a specific key or set of keys. It has no
|
|
effect when listing all keys.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--keyring &ParmFile;</term>
|
|
<listitem><para>
|
|
Add &ParmFile to the list of keyrings.
|
|
If &ParmFile begins with a tilde and a slash, these
|
|
are replaced by the HOME directory. If the filename
|
|
does not contain a slash, it is assumed to be in the
|
|
home-directory ("~/.gnupg" if --homedir is not used).
|
|
The filename may be prefixed with a scheme:</para>
|
|
<para>"gnupg-ring:" is the default one.</para>
|
|
<para>It might make sense to use it together with --no-default-keyring.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--secret-keyring &ParmFile;</term>
|
|
<listitem><para>
|
|
Same as --keyring but for the secret keyrings.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--primary-keyring &ParmFile;</term>
|
|
<listitem<para>
|
|
Designate &ParmFile; as the primary public keyring. This means that
|
|
newly imported keys (via --import or keyserver --recv-from) will go to
|
|
this keyring.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--homedir &ParmDir;</term>
|
|
<listitem><para>
|
|
Set the name of the home directory to &ParmDir; If this
|
|
option is not used it defaults to "~/.gnupg". It does
|
|
not make sense to use this in a options file. This
|
|
also overrides the environment variable "GNUPGHOME".
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--charset &ParmName;</term>
|
|
<listitem><para>
|
|
Set the name of the native character set. This is used
|
|
to convert some strings to proper UTF-8 encoding. If this option is not used, the default character set is determined
|
|
from the current locale. A verbosity level of 3 shows the used one.
|
|
Valid values for &ParmName; are:</para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>iso-8859-1</term><listitem><para>This is the Latin 1 set.</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>iso-8859-2</term><listitem><para>The Latin 2 set.</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>iso-8859-15</term><listitem><para>This is currently an alias for
|
|
the Latin 1 set.</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>koi8-r</term><listitem><para>The usual Russian set (rfc1489).</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>utf-8</term><listitem><para>Bypass all translations and assume
|
|
that the OS uses native UTF-8 encoding.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--utf8-strings</term>
|
|
<term>--no-utf8-strings</term>
|
|
<listitem><para>
|
|
Assume that the arguments are already given as UTF8 strings. The default
|
|
(--no-utf8-strings)
|
|
is to assume that arguments are encoded in the character set as specified
|
|
by --charset. These options affect all following arguments. Both options may
|
|
be used multiple times.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--options &ParmFile;</term>
|
|
<listitem><para>
|
|
Read options from &ParmFile; and do not try to read
|
|
them from the default options file in the homedir
|
|
(see --homedir). This option is ignored if used
|
|
in an options file.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no-options</term>
|
|
<listitem><para>
|
|
Shortcut for "--options /dev/null". This option is
|
|
detected before an attempt to open an option file.
|
|
Using this option will also prevent the creation of a
|
|
"~./gnupg" homedir.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--load-extension &ParmName;</term>
|
|
<listitem><para>
|
|
Load an extension module. If &ParmName; does not contain a slash it is
|
|
searched for in the directory configured when GnuPG was built
|
|
(generally "/usr/local/lib/gnupg"). Extensions are not generally
|
|
useful anymore, and the use of this option is deprecated.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--debug &ParmFlags;</term>
|
|
<listitem><para>
|
|
Set debugging flags. All flags are or-ed and &ParmFlags; may
|
|
be given in C syntax (e.g. 0x0042).
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--debug-all</term>
|
|
<listitem><para>
|
|
Set all useful debugging flags.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--status-fd &ParmN;</term>
|
|
<listitem><para>
|
|
Write special status strings to the file descriptor &ParmN;.
|
|
See the file DETAILS in the documentation for a listing of them.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--logger-fd &ParmN;</term>
|
|
<listitem><para>
|
|
Write log output to file descriptor &ParmN; and not to stderr.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--attribute-fd &ParmN;</term>
|
|
<listitem><para>
|
|
Write attribute subpackets to the file descriptor &ParmN;. This is
|
|
most useful for use with --status-fd, since the status messages are
|
|
needed to separate out the various subpackets from the stream
|
|
delivered to the file descriptor.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--sk-comments</term>
|
|
<listitem><para>
|
|
Include secret key comment packets when exporting secret keys. This
|
|
is a GnuPG extension to the OpenPGP standard, and is off by default.
|
|
Please note that this has nothing to do with the comments in clear
|
|
text signatures or armor headers.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-sk-comments</term>
|
|
<listitem><para>
|
|
Resets the --sk-comments option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-comment</term>
|
|
<listitem><para>
|
|
See --sk-comments. This option is deprecated and may be removed soon.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--comment &ParmString;</term>
|
|
<listitem><para>
|
|
Use &ParmString; as comment string in clear text signatures.
|
|
The default is not do write a comment string.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--default-comment</term>
|
|
<listitem><para>
|
|
Force to write the standard comment string in clear
|
|
text signatures. Use this to overwrite a --comment
|
|
from a config file. This option is now obsolete because there is no
|
|
default comment string anymore.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no-version</term>
|
|
<listitem><para>
|
|
Omit the version string in clear text signatures.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--emit-version</term>
|
|
<listitem><para>
|
|
Force to write the version string in clear text
|
|
signatures. Use this to overwrite a previous
|
|
--no-version from a config file.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--sig-notation &ParmNameValue;</term>
|
|
<term>--cert-notation &ParmNameValue;</term>
|
|
<term>-N, --notation-data &ParmNameValue;</term>
|
|
<listitem><para>
|
|
Put the name value pair into the signature as notation data.
|
|
&ParmName; must consist only of printable characters or spaces, and
|
|
must contain a '@' character. This is to help prevent pollution of
|
|
the IETF reserved notation namespace. The --expert flag overrides the
|
|
'@' check. &ParmValue; may be any printable string; it will be
|
|
encoded in UTF8, so you should check that your --charset is set
|
|
correctly. If you prefix &ParmName; with an exclamation mark, the
|
|
notation data will be flagged as critical (rfc2440:5.2.3.15).
|
|
--sig-notation sets a notation for data signatures. --cert-notation
|
|
sets a notation for key signatures (certifications). --notation-data
|
|
sets both.
|
|
</para>
|
|
|
|
<para>
|
|
There are special codes that may be used in notation names. "%k" will
|
|
be expanded into the key ID of the key being signed, "%K" for the long
|
|
key ID of the key being signed, "%f" for the key fingerprint of the
|
|
key being signed, "%s" for the key ID of the key making the signature,
|
|
"%S" for the long key ID of the key making the signature, and "%%"
|
|
results in a single "%". %k, %K, and %f are only meaningful when
|
|
making a key signature (certification).
|
|
</para>
|
|
|
|
</listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--show-notation</term>
|
|
<listitem><para>
|
|
Show signature notations in the --list-sigs or --check-sigs listings
|
|
as well as when verifying a signature with a notation in it.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-show-notation</term>
|
|
<listitem><para>
|
|
Do not show signature notations.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--sig-policy-url &ParmString;</term>
|
|
<term>--cert-policy-url &ParmString;</term>
|
|
<term>--set-policy-url &ParmString;</term>
|
|
<listitem><para>
|
|
Use &ParmString; as Policy URL for signatures (rfc2440:5.2.3.19). If
|
|
you prefix it with an exclamation mark, the policy URL packet will be
|
|
flagged as critical. --sig-policy-url sets a a policy url for data
|
|
signatures. --cert-policy-url sets a policy url for key signatures
|
|
(certifications). -set-policy-url sets both.
|
|
</para>
|
|
|
|
<para>
|
|
The same %-expandos used for notation data are available here as well.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--show-policy-url</term>
|
|
<listitem><para>
|
|
Show policy URLs in the --list-sigs or --check-sigs listings as well
|
|
as when verifying a signature with a policy URL in it.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-show-policy-url</term>
|
|
<listitem><para>
|
|
Do not show policy URLs.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--set-filename &ParmString;</term>
|
|
<listitem><para>
|
|
Use &ParmString; as the name of file which is stored in
|
|
messages.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--for-your-eyes-only</term>
|
|
<listitem><para>
|
|
Set the `for your eyes only' flag in the message. This causes GnuPG
|
|
to refuse to save the file unless the --output option is given, and
|
|
PGP to use the "secure viewer" with a Tempest-resistant font to
|
|
display the message. This option overrides --set-filename.
|
|
</para></listitem></varlistentry
|
|
|
|
<varlistentry>
|
|
<term>--no-for-your-eyes-only</term>
|
|
<listitem><para>
|
|
Resets the --for-your-eyes-only flag.
|
|
</para></listitem></varlistentry
|
|
|
|
<varlistentry>
|
|
<term>--use-embedded-filename</term>
|
|
<listitem><para>
|
|
Try to create a file with a name as embedded in the data.
|
|
This can be a dangerous option as it allows to overwrite files.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--completes-needed &ParmN;</term>
|
|
<listitem><para>
|
|
Number of completely trusted users to introduce a new
|
|
key signer (defaults to 1).
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--marginals-needed &ParmN;</term>
|
|
<listitem><para>
|
|
Number of marginally trusted users to introduce a new
|
|
key signer (defaults to 3)
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--max-cert-depth &ParmN;</term>
|
|
<listitem><para>
|
|
Maximum depth of a certification chain (default is 5).
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--cipher-algo &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName; as cipher algorithm. Running the program
|
|
with the command --version yields a list of supported
|
|
algorithms. If this is not used the cipher algorithm is
|
|
selected from the preferences stored with the key.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--digest-algo &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName; as the message digest algorithm. Running the program
|
|
with the command --version yields a list of supported algorithms.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--compress-algo &ParmName;</term>
|
|
<listitem><para>
|
|
Use compression algorithm &ParmName;. "zlib" is RFC1950 ZLIB
|
|
compression. "zip" is RFC-1951 ZIP compression which is used by PGP.
|
|
"uncompressed" or "none" disables compression. If this option is not
|
|
used, the default behavior is to examine the recipient key preferences
|
|
to see which algorithms the recipient supports. If all else fails,
|
|
ZIP is used for maximum compatibility. Note, however, that ZLIB may
|
|
give better compression results if that is more important, as the
|
|
compression window size is not limited to 8k.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--cert-digest-algo &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName; as the message digest algorithm used when signing a
|
|
key. Running the program with the command --version yields a list of
|
|
supported algorithms. Be aware that if you choose an algorithm that
|
|
GnuPG supports but other OpenPGP implementations do not, then some
|
|
users will not be able to use the key signatures you make, or quite
|
|
possibly your entire key.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--s2k-cipher-algo &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName; as the cipher algorithm used to protect secret keys.
|
|
The default cipher is CAST5. This cipher is also used for
|
|
conventional encryption if --personal-cipher-preferences and
|
|
--cipher-algo is not given.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--s2k-digest-algo &ParmName;</term>
|
|
<listitem><para>
|
|
Use &ParmName; as the digest algorithm used to mangle the passphrases.
|
|
The default algorithm is SHA-1.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--s2k-mode &ParmN;</term>
|
|
<listitem><para>
|
|
Selects how passphrases are mangled. If &ParmN; is 0 a plain
|
|
passphrase (which is not recommended) will be used, a 1 adds a salt to
|
|
the passphrase and a 3 (the default) iterates the whole process a
|
|
couple of times. Unless --rfc1991 is used, this mode is also used for
|
|
conventional encryption.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--simple-sk-checksum</term>
|
|
<listitem><para>
|
|
Secret keys are integrity protected by using a SHA-1 checksum. This
|
|
method will be part of an enhanced OpenPGP specification but GnuPG
|
|
already uses it as a countermeasure against certain attacks. Old
|
|
applications don't understand this new format, so this option may be
|
|
used to switch back to the old behaviour. Using this this option
|
|
bears a security risk. Note that using this option only takes effect
|
|
when the secret key is encrypted - the simplest way to make this
|
|
happen is to change the passphrase on the key (even changing it to the
|
|
same value is acceptable).
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--disable-cipher-algo &ParmName;</term>
|
|
<listitem><para>
|
|
Never allow the use of &ParmName; as cipher algorithm.
|
|
The given name will not be checked so that a later loaded algorithm
|
|
will still get disabled.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--disable-pubkey-algo &ParmName;</term>
|
|
<listitem><para>
|
|
Never allow the use of &ParmName; as public key algorithm.
|
|
The given name will not be checked so that a later loaded algorithm
|
|
will still get disabled.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-sig-cache</term>
|
|
<listitem><para>
|
|
Do not cache the verification status of key signatures.
|
|
Caching gives a much better performance in key listings. However, if
|
|
you suspect that your public keyring is not save against write
|
|
modifications, you can use this option to disable the caching. It
|
|
probably does not make sense to disable it because all kind of damage
|
|
can be done if someone else has write access to your public keyring.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-sig-create-check</term>
|
|
<listitem><para>
|
|
GnuPG normally verifies each signature right after creation to protect
|
|
against bugs and hardware malfunctions which could leak out bits from
|
|
the secret key. This extra verification needs some time (about 115%
|
|
for DSA keys), and so this option can be used to disable it.
|
|
However, due to the fact that the signature creation needs manual
|
|
interaction, this performance penalty does not matter in most settings.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--auto-check-trustdb</term>
|
|
<listitem><para>
|
|
If GnuPG feels that its information about the Web-of-Trust has to be
|
|
updated, it automatically runs the --check-trustdb command
|
|
internally. This may be a time consuming process.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-auto-check-trustdb</term>
|
|
<listitem><para>
|
|
Resets the --auto-check-trustdb option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--throw-keyid</term>
|
|
<listitem><para>
|
|
Do not put the keyids into encrypted packets. This option hides the
|
|
receiver of the message and is a countermeasure against traffic
|
|
analysis. It may slow down the decryption process because all
|
|
available secret keys are tried.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-throw-keyid</term>
|
|
<listitem><para>
|
|
Resets the --throw-keyid option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--not-dash-escaped</term>
|
|
<listitem><para>
|
|
This option changes the behavior of cleartext signatures
|
|
so that they can be used for patch files. You should not
|
|
send such an armored file via email because all spaces
|
|
and line endings are hashed too. You can not use this
|
|
option for data which has 5 dashes at the beginning of a
|
|
line, patch files don't have this. A special armor header
|
|
line tells GnuPG about this cleartext signature option.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--escape-from-lines</term>
|
|
<listitem><para>
|
|
Because some mailers change lines starting with "From "
|
|
to "<From " it is good to handle such lines in a special
|
|
way when creating cleartext signatures. All other PGP
|
|
versions do it this way too. This option is not enabled
|
|
by default because it would violate rfc2440.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--passphrase-fd &ParmN;</term>
|
|
<listitem><para>
|
|
Read the passphrase from file descriptor &ParmN;. If you use
|
|
0 for &ParmN;, the passphrase will be read from stdin. This
|
|
can only be used if only one passphrase is supplied.
|
|
<!--fixme: make this print strong-->
|
|
Don't use this option if you can avoid it.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--command-fd &ParmN;</term>
|
|
<listitem><para>
|
|
This is a replacement for the deprecated shared-memory IPC mode.
|
|
If this option is enabled, user input on questions is not expected
|
|
from the TTY but from the given file descriptor. It should be used
|
|
together with --status-fd. See the file doc/DETAILS in the source
|
|
distribution for details on how to use it.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--use-agent</term>
|
|
<listitem><para>
|
|
Try to use the GnuPG-Agent. Please note that this agent is still under
|
|
development. With this option, GnuPG first tries to connect to the
|
|
agent before it asks for a passphrase.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--gpg-agent-info</term>
|
|
<listitem><para>
|
|
Override the value of the environment variable
|
|
<literal>GPG_AGENT_INFO</>. This is only used when --use-agent has been given
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--rfc1991</term>
|
|
<listitem><para>
|
|
Try to be more RFC1991 (PGP 2.x) compliant.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--pgp2</term>
|
|
<listitem><para>
|
|
Set up all options to be as PGP 2.x compliant as possible, and warn if
|
|
an action is taken (e.g. encrypting to a non-RSA key) that will create
|
|
a message that PGP 2.x will not be able to handle. Note that `PGP
|
|
2.x' here means `MIT PGP 2.6.2'. There are other versions of PGP 2.x
|
|
available, but the MIT release is a good common baseline.
|
|
</para><para>
|
|
This option implies `--rfc1991 --no-openpgp --disable-mdc
|
|
--no-force-v4-certs --no-comment --escape-from-lines --force-v3-sigs
|
|
--no-ask-sig-expire --no-ask-cert-expire --cipher-algo IDEA
|
|
--digest-algo MD5 --compress-algo 1'. It also disables --textmode
|
|
when encrypting.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-pgp2</term>
|
|
<listitem><para>
|
|
Resets the --pgp2 option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--pgp6</term>
|
|
<listitem><para>
|
|
Set up all options to be as PGP 6 compliant as possible. This
|
|
restricts you to the ciphers IDEA (if the IDEA plugin is installed),
|
|
3DES, and CAST5, the hashes MD5, SHA1 and RIPEMD160, and the
|
|
compression algorithms none and ZIP. This also disables
|
|
--throw-keyid, and making signatures with signing subkeys as PGP 6
|
|
does not understand signatures made by signing subkeys.
|
|
</para><para>
|
|
This option implies `--disable-mdc --no-comment --escape-from-lines
|
|
--force-v3-sigs --no-ask-sig-expire --compress-algo 1'
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-pgp6</term>
|
|
<listitem><para>
|
|
Resets the --pgp6 option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--pgp7</term>
|
|
<listitem><para>
|
|
Set up all options to be as PGP 7 compliant as possible. This is
|
|
identical to --pgp6 except that MDCs are not disabled, and the list of
|
|
allowable ciphers is expanded to add AES128, AES192, AES256, and
|
|
TWOFISH.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-pgp7</term>
|
|
<listitem><para>
|
|
Resets the --pgp7 option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--pgp8</term>
|
|
<listitem><para>
|
|
Set up all options to be as PGP 8 compliant as possible. PGP 8 is a
|
|
lot closer to the OpenPGP standard than previous versions of PGP, so
|
|
all this does is disable --throw-keyid and set --escape-from-lines and
|
|
--compress-algo 1. The allowed algorithms list is the same as --pgp7.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-pgp8</term>
|
|
<listitem><para>
|
|
Resets the --pgp8 option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--openpgp</term>
|
|
<listitem><para>
|
|
Reset all packet, cipher and digest options to OpenPGP behavior. Use
|
|
this option to reset all previous options like --rfc1991,
|
|
--force-v3-sigs, --s2k-*, --cipher-algo, --digest-algo and
|
|
--compress-algo to OpenPGP compliant values. All PGP workarounds are
|
|
also disabled.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--force-v3-sigs</term>
|
|
<listitem><para>
|
|
OpenPGP states that an implementation should generate v4 signatures
|
|
but PGP versions 5 and higher only recognize v4 signatures on key
|
|
material. This option forces v3 signatures for signatures on data.
|
|
Note that this option overrides --ask-sig-expire, as v3 signatures
|
|
cannot have expiration dates.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-force-v3-sigs</term>
|
|
<listitem><para>
|
|
Reset the --force-v3-sigs option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--force-v4-certs</term>
|
|
<listitem><para>
|
|
Always use v4 key signatures even on v3 keys. This option also
|
|
changes the default hash algorithm for v3 RSA keys from MD5 to SHA-1.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-force-v4-certs</term>
|
|
<listitem><para>
|
|
Reset the --force-v4-certs option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--force-mdc</term>
|
|
<listitem><para>
|
|
Force the use of encryption with a modification detection code. This
|
|
is always used with the newer ciphers (those with a blocksize greater
|
|
than 64 bits), or if the recipient key has one of those ciphers as a
|
|
preference.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--disable-mdc</term>
|
|
<listitem><para>
|
|
Disable the use of the modification detection code. Note that by
|
|
using this option, the encrypted message becomes vulnerable to a
|
|
message modification attack.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--allow-non-selfsigned-uid</term>
|
|
<listitem><para>
|
|
Allow the import and use of keys with user IDs which are not
|
|
self-signed. This is not recommended, as a non self-signed user ID is
|
|
trivial to forge.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-allow-non-selfsigned-uid</term>
|
|
<listitem><para>
|
|
Reset the --allow-non-selfsigned-uid option.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--allow-freeform-uid</term>
|
|
<listitem><para>
|
|
Disable all checks on the form of the user ID while generating a new
|
|
one. This option should only be used in very special environments as
|
|
it does not ensure the de-facto standard format of user IDs.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--ignore-time-conflict</term>
|
|
<listitem><para>
|
|
GnuPG normally checks that the timestamps associated with keys and
|
|
signatures have plausible values. However, sometimes a signature seems to
|
|
be older than the key due to clock problems. This option makes these
|
|
checks just a warning.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--ignore-valid-from</term>
|
|
<listitem><para>
|
|
GnuPG normally does not select and use subkeys created in the future. This
|
|
option allows the use of such keys and thus exhibits the pre-1.0.7
|
|
behaviour. You should not use this option unless you there is some
|
|
clock problem.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--ignore-crc-error</term>
|
|
<listitem><para>
|
|
The ASCII armor used by OpenPGP is protected by a CRC checksum against
|
|
transmission errors. Sometimes it happens that the CRC gets mangled
|
|
somewhere on the transmission channel but the actual content (which is
|
|
protected by the OpenPGP protocol anyway) is still okay. This option
|
|
will let gpg ignore CRC errors.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--ignore-mdc-error</term>
|
|
<listitem><para>
|
|
This option changes a MDC integrity protection failure into a warning.
|
|
This can be useful if a message is partially corrupt, but it is
|
|
necessary to get as much data as possible out of the corrupt message.
|
|
However, be aware that a MDC protection failure may also mean that the
|
|
message was tampered with intentionally by an attacker.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--lock-once</term>
|
|
<listitem><para>
|
|
Lock the databases the first time a lock is requested
|
|
and do not release the lock until the process
|
|
terminates.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--lock-multiple</term>
|
|
<listitem><para>
|
|
Release the locks every time a lock is no longer
|
|
needed. Use this to override a previous --lock-once
|
|
from a config file.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--lock-never</term>
|
|
<listitem><para>
|
|
Disable locking entirely. This option should be used only in very
|
|
special environments, where it can be assured that only one process
|
|
is accessing those files. A bootable floppy with a stand-alone
|
|
encryption system will probably use this. Improper usage of this
|
|
option may lead to data and key corruption.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-random-seed-file</term>
|
|
<listitem><para>
|
|
GnuPG uses a file to store its internal random pool over invocations.
|
|
This makes random generation faster; however sometimes write operations
|
|
are not desired. This option can be used to achieve that with the cost of
|
|
slower random generation.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no-verbose</term>
|
|
<listitem><para>
|
|
Reset verbose level to 0.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no-greeting</term>
|
|
<listitem><para>
|
|
Suppress the initial copyright message but do not
|
|
enter batch mode.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-secmem-warning</term>
|
|
<listitem><para>
|
|
Suppress the warning about "using insecure memory".
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-permission-warning</term>
|
|
<listitem><para>
|
|
Suppress the warning about unsafe file permissions. Note that the
|
|
file permission checks that GnuPG does are not intended to be
|
|
authoritative, rather they simply warn about certain common permission
|
|
problems. Do not assume that the lack of a warning means that your
|
|
system is secure.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-mdc-warning</term>
|
|
<listitem><para>
|
|
Suppress the warning about missing MDC integrity protection.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no-armor</term>
|
|
<listitem><para>
|
|
Assume the input data is not in ASCII armored format.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--no-default-keyring</term>
|
|
<listitem><para>
|
|
Do not add the default keyrings to the list of
|
|
keyrings.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--skip-verify</term>
|
|
<listitem><para>
|
|
Skip the signature verification step. This may be
|
|
used to make the decryption faster if the signature
|
|
verification is not needed.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--with-colons</term>
|
|
<listitem><para>
|
|
Print key listings delimited by colons. Note, that the output will be
|
|
encoded in UTF-8 regardless of any --charset setting.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
<varlistentry>
|
|
<term>--with-key-data</term>
|
|
<listitem><para>
|
|
Print key listings delimited by colons (like --with-colons) and print the public key data.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--with-fingerprint</term>
|
|
<listitem><para>
|
|
Same as the command --fingerprint but changes only the format of the output
|
|
and may be used together with another command.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--fast-list-mode</term>
|
|
<listitem><para>
|
|
Changes the output of the list commands to work faster; this is achieved
|
|
by leaving some parts empty. Some applications don't need the user ID and
|
|
the trust information given in the listings. By using this options they
|
|
can get a faster listing. The exact behaviour of this option may change
|
|
in future versions.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--fixed-list-mode</term>
|
|
<listitem><para>
|
|
Do not merge user ID and primary key in --with-colon listing mode and
|
|
print all timestamps as seconds since 1970-01-01.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--list-only</term>
|
|
<listitem><para>
|
|
Changes the behaviour of some commands. This is like --dry-run but
|
|
different in some cases. The semantic of this command may be extended in
|
|
the future. Currently it only skips the actual decryption pass and
|
|
therefore enables a fast listing of the encryption keys.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-literal</term>
|
|
<listitem><para>
|
|
This is not for normal use. Use the source to see for what it might be useful.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--set-filesize</term>
|
|
<listitem><para>
|
|
This is not for normal use. Use the source to see for what it might be useful.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--emulate-md-encode-bug</term>
|
|
<listitem><para>
|
|
GnuPG versions prior to 1.0.2 had a bug in the way a signature was encoded.
|
|
This options enables a workaround by checking faulty signatures again with
|
|
the encoding used in old versions. This may only happen for ElGamal signatures
|
|
which are not widely used.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--show-session-key</term>
|
|
<listitem><para>
|
|
Display the session key used for one message. See --override-session-key
|
|
for the counterpart of this option.
|
|
</para>
|
|
<para>
|
|
We think that Key-Escrow is a Bad Thing; however the user should
|
|
have the freedom to decide whether to go to prison or to reveal the content of
|
|
one specific message without compromising all messages ever encrypted for one
|
|
secret key. DON'T USE IT UNLESS YOU ARE REALLY FORCED TO DO SO.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--override-session-key &ParmString; </term>
|
|
<listitem><para>
|
|
Don't use the public key but the session key &ParmString;. The format of this
|
|
string is the same as the one printed by --show-session-key. This option
|
|
is normally not used but comes handy in case someone forces you to reveal the
|
|
content of an encrypted message; using this option you can do this without
|
|
handing out the secret key.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--ask-sig-expire</term>
|
|
<listitem><para>
|
|
When making a data signature, prompt for an expiration time. If this
|
|
option is not specified, the expiration time is "never".
|
|
</para></listitem></varlistentry
|
|
|
|
<varlistentry>
|
|
<term>--no-ask-sig-expire</term>
|
|
<listitem><para>
|
|
Resets the --ask-sig-expire option.
|
|
</para></listitem></varlistentry
|
|
|
|
<varlistentry>
|
|
<term>--ask-cert-expire</term>
|
|
<listitem><para>
|
|
When making a key signature, prompt for an expiration time. If this
|
|
option is not specified, the expiration time is "never".
|
|
</para></listitem></varlistentry
|
|
|
|
<varlistentry>
|
|
<term>--no-ask-cert-expire</term>
|
|
<listitem><para>
|
|
Resets the --ask-cert-expire option.
|
|
</para></listitem></varlistentry
|
|
|
|
<varlistentry>
|
|
<term>--expert</term>
|
|
<listitem><para>
|
|
Allow the user to do certain nonsensical or "silly" things like
|
|
signing an expired or revoked key, or certain potentially incompatible
|
|
things like generating deprecated key types. This also disables
|
|
certain warning messages about potentially incompatible actions. As
|
|
the name implies, this option is for experts only. If you don't fully
|
|
understand the implications of what it allows you to do, leave this
|
|
off.
|
|
</para></listitem></varlistentry
|
|
|
|
<varlistentry>
|
|
<term>--no-expert</term>
|
|
<listitem><para>
|
|
Resets the --expert option.
|
|
</para></listitem></varlistentry
|
|
|
|
<varlistentry>
|
|
<term>--merge-only</term>
|
|
<listitem><para>
|
|
Don't insert new keys into the keyrings while doing an import.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--allow-secret-key-import</term>
|
|
<listitem><para>
|
|
This is an obsolete option and is not used anywhere.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--try-all-secrets</term>
|
|
<listitem><para>
|
|
Don't look at the key ID as stored in the message but try all secret keys in
|
|
turn to find the right decryption key. This option forces the behaviour as
|
|
used by anonymous recipients (created by using --throw-keyid) and might come
|
|
handy in case where an encrypted message contains a bogus key ID.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--enable-special-filenames</term>
|
|
<listitem><para>
|
|
This options enables a mode in which filenames of the form
|
|
<filename>-&n</>, where n is a non-negative decimal number,
|
|
refer to the file descriptor n and not to a file with that name.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--no-expensive-trust-checks</term>
|
|
<listitem><para>
|
|
Experimental use only.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--group &ParmNameValues;</term>
|
|
<listitem><para>
|
|
Sets up a named group, which is similar to aliases in email programs.
|
|
Any time the group name is a receipient (-r or --recipient), it will
|
|
be expanded to the values specified.
|
|
</para><para>
|
|
The values are &ParmKeyIDs; or fingerprints, but any key description
|
|
is accepted. Note that a value with spaces in it will be treated as
|
|
two different values. Note also there is only one level of expansion
|
|
- you cannot make an group that points to another group. When used
|
|
from the command line, it may be necessary to quote the argument to
|
|
this option to prevent the shell from treating it as multiple
|
|
arguments.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--preserve-permissions</term>
|
|
<listitem><para>
|
|
Don't change the permissions of a secret keyring back to user
|
|
read/write only. Use this option only if you really know what you are doing.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--personal-cipher-preferences &ParmString;</term>
|
|
<listitem><para>
|
|
Set the list of personal cipher preferences to &ParmString;, this list
|
|
should be a string similar to the one printed by the command "pref" in
|
|
the edit menu. This allows the user to factor in their own preferred
|
|
algorithms when algorithms are chosen via recipient key preferences.
|
|
The most highly ranked cipher in this list is also used for the
|
|
--symmetric encryption command.
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--personal-digest-preferences &ParmString;</term>
|
|
<listitem><para>
|
|
Set the list of personal digest preferences to &ParmString;, this list
|
|
should be a string similar to the one printed by the command "pref" in
|
|
the edit menu. This allows the user to factor in their own preferred
|
|
algorithms when algorithms are chosen via recipient key preferences.
|
|
The most highly ranked digest algorithm in this list is algo used when
|
|
signing without encryption (e.g. --clearsign or --sign).
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--personal-compress-preferences &ParmString;</term>
|
|
<listitem><para>
|
|
Set the list of personal compression preferences to &ParmString;, this
|
|
list should be a string similar to the one printed by the command
|
|
"pref" in the edit menu. This allows the user to factor in their own
|
|
preferred algorithms when algorithms are chosen via recipient key
|
|
preferences. The most highly ranked algorithm in this list is also
|
|
used when there are no recipient keys to consider (e.g. --symmetric).
|
|
</para></listitem></varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>--default-preference-list &ParmString;</term>
|
|
<listitem><para>
|
|
Set the list of default preferences to &ParmString;, this list should
|
|
be a string similar to the one printed by the command "pref" in the
|
|
edit menu. This affects both key generation and "updpref" in the edit
|
|
menu.
|
|
</para></listitem></varlistentry>
|
|
|
|
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
|
|
<refsect1>
|
|
<title>How to specify a user ID</title>
|
|
<para>
|
|
There are different ways on how to specify a user ID to GnuPG;
|
|
here are some examples:
|
|
</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term></term>
|
|
<listitem><para></para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>234567C4</term>
|
|
<term>0F34E556E</term>
|
|
<term>01347A56A</term>
|
|
<term>0xAB123456</term>
|
|
<listitem><para>
|
|
Here the key ID is given in the usual short form.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>234AABBCC34567C4</term>
|
|
<term>0F323456784E56EAB</term>
|
|
<term>01AB3FED1347A5612</term>
|
|
<term>0x234AABBCC34567C4</term>
|
|
<listitem><para>
|
|
Here the key ID is given in the long form as used by OpenPGP
|
|
(you can get the long key ID using the option --with-colons).
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>1234343434343434C434343434343434</term>
|
|
<term>123434343434343C3434343434343734349A3434</term>
|
|
<term>0E12343434343434343434EAB3484343434343434</term>
|
|
<term>0xE12343434343434343434EAB3484343434343434</term>
|
|
<listitem><para>
|
|
The best way to specify a key ID is by using the fingerprint of
|
|
the key. This avoids any ambiguities in case that there are duplicated
|
|
key IDs (which are really rare for the long key IDs).
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>=Heinrich Heine <heinrichh@uni-duesseldorf.de></term>
|
|
<listitem><para>
|
|
Using an exact to match string. The equal sign indicates this.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><heinrichh@uni-duesseldorf.de></term>
|
|
<listitem><para>
|
|
Using the email address part which must match exactly. The left angle bracket
|
|
indicates this email address mode.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>+Heinrich Heine duesseldorf</term>
|
|
<listitem><para>
|
|
All words must match exactly (not case sensitive) but can appear in
|
|
any order in the user ID. Words are any sequences of letters,
|
|
digits, the underscore and all characters with bit 7 set.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>Heine</term>
|
|
<term>*Heine</term>
|
|
<listitem><para>
|
|
By case insensitive substring matching. This is the default mode but
|
|
applications may want to explicitly indicate this by putting the asterisk
|
|
in front.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
|
|
<para>
|
|
Note that you can append an exclamation mark to key IDs or
|
|
fingerprints. This flag tells GnuPG to use exactly the given primary
|
|
or secondary key and not to try to figure out which secondary or
|
|
primary key to use.
|
|
</para>
|
|
|
|
</refsect1>
|
|
|
|
|
|
<refsect1>
|
|
<title>RETURN VALUE</title>
|
|
<para>
|
|
The program returns 0 if everything was fine, 1 if at least
|
|
a signature was bad, and other error codes for fatal errors.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>EXAMPLES</title>
|
|
<variablelist>
|
|
|
|
<varlistentry>
|
|
<term>gpg -se -r <parameter/Bob/ &ParmFile;</term>
|
|
<listitem><para>sign and encrypt for user Bob</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>gpg --clearsign &ParmFile;</term>
|
|
<listitem><para>make a clear text signature</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>gpg -sb &ParmFile;</term>
|
|
<listitem><para>make a detached signature</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>gpg --list-keys <parameter/user_ID/</term>
|
|
<listitem><para>show keys</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>gpg --fingerprint <parameter/user_ID/</term>
|
|
<listitem><para>show fingerprint</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>gpg --verify <parameter/pgpfile/</term>
|
|
<term>gpg --verify <parameter/sigfile/ &OptParmFiles;</term>
|
|
<listitem><para>
|
|
Verify the signature of the file but do not output the data. The second form
|
|
is used for detached signatures, where <parameter/sigfile/ is the detached
|
|
signature (either ASCII armored of binary) and &OptParmFiles are the signed
|
|
data; if this is not given the name of the file holding the signed data is
|
|
constructed by cutting off the extension (".asc" or ".sig") of
|
|
<parameter/sigfile/ or by asking the user for the filename.
|
|
</para></listitem></varlistentry>
|
|
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
|
|
<refsect1>
|
|
<title>ENVIRONMENT</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>HOME</term>
|
|
<listitem><para>Used to locate the default home directory.</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>GNUPGHOME</term>
|
|
<listitem><para>If set directory used instead of "~/.gnupg".</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>GPG_AGENT_INFO</term>
|
|
<listitem><para>Used to locate the gpg-agent; only honored when
|
|
--use-agent is set. The value consists of 3 colon delimited fields:
|
|
The first is the path to the Unix Domain Socket, the second the PID of
|
|
the gpg-agent and the protocol version which should be set to 1. When
|
|
starting the gpg-agent as described in its documentation, this
|
|
variable is set to the correct value. The option --gpg-agent-info can
|
|
be used to override it.</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>http_proxy</term>
|
|
<listitem><para>Only honored when the keyserver-option
|
|
honor-http-proxy is set.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>FILES</title>
|
|
<variablelist>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/secring.gpg</term>
|
|
<listitem><para>The secret keyring</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/secring.gpg.lock</term>
|
|
<listitem><para>and the lock file</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/pubring.gpg</term>
|
|
<listitem><para>The public keyring</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/pubring.gpg.lock</term>
|
|
<listitem><para>and the lock file</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/trustdb.gpg</term>
|
|
<listitem><para>The trust database</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/trustdb.gpg.lock</term>
|
|
<listitem><para>and the lock file</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/random_seed</term>
|
|
<listitem><para>used to preserve the internal random pool</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/gpg.conf</term>
|
|
<listitem><para>Default configuration file</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>~/.gnupg/options</term>
|
|
<listitem><para>Old style configuration file; only used when gpg.conf
|
|
is not found</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>/usr[/local]/share/gnupg/options.skel</term>
|
|
<listitem><para>Skeleton options file</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>/usr[/local]/lib/gnupg/</term>
|
|
<listitem><para>Default location for extensions</para></listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<!-- SEE ALSO not yet needed-->
|
|
|
|
<refsect1>
|
|
<title>WARNINGS</title>
|
|
<para>
|
|
Use a *good* password for your user account and a *good* passphrase
|
|
to protect your secret key. This passphrase is the weakest part of the
|
|
whole system. Programs to do dictionary attacks on your secret keyring
|
|
are very easy to write and so you should protect your "~/.gnupg/"
|
|
directory very well.
|
|
</para>
|
|
<para>
|
|
Keep in mind that, if this program is used over a network (telnet), it
|
|
is *very* easy to spy out your passphrase!
|
|
</para>
|
|
<para>
|
|
If you are going to verify detached signatures, make sure that the
|
|
program knows about it; either be giving both filenames on the
|
|
command line or using <literal>-</literal> to specify stdin.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>INTEROPERABILITY WITH OTHER OPENPGP PROGRAMS</title>
|
|
<para>
|
|
GnuPG tries to be a very flexible implementation of the OpenPGP
|
|
standard. In particular, GnuPG implements many of the "optional"
|
|
parts of the standard, such as the RIPEMD/160 hash, and the ZLIB
|
|
compression algorithms. It is important to be aware that not all
|
|
OpenPGP programs implement these optional algorithms and that by
|
|
forcing their use via the --cipher-algo, --digest-algo,
|
|
--cert-digest-algo, or --compress-algo options in GnuPG, it is
|
|
possible to create a perfectly valid OpenPGP message, but one that
|
|
cannot be read by the intended recipient.
|
|
</para>
|
|
|
|
<para>
|
|
For example, as of this writing, no version of official PGP supports
|
|
the BLOWFISH cipher algorithm. If you use it, no PGP user will be
|
|
able to decrypt your message. The same thing applies to the ZLIB
|
|
compression algorithm. By default, GnuPG will do the right thing and
|
|
create messages that are usable by any OpenPGP program. Only override
|
|
this safe default if you know what you are doing.
|
|
</para>
|
|
|
|
<para>
|
|
If you absolutely must override the safe default, you are far better
|
|
off using the --pgp2, --pgp6, or --pgp7 options. These options are
|
|
safe as they do not force any particular algorithms in violation of
|
|
OpenPGP, but rather reduce the available algorithms to a "PGP-safe"
|
|
list.
|
|
</para>
|
|
|
|
</refsect1>
|
|
|
|
|
|
<refsect1>
|
|
<title>BUGS</title>
|
|
<para>
|
|
On many systems this program should be installed as setuid(root). This
|
|
is necessary to lock memory pages. Locking memory pages prevents the
|
|
operating system from writing memory pages to disk. If you get no
|
|
warning message about insecure memory your operating system supports
|
|
locking without being root. The program drops root privileges as soon
|
|
as locked memory is allocated.
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|