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Update for decision/info from https://github.com/DP-3T/documents/issues/145

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Dirk-Willem van Gulik 2020-04-13 21:08:56 +02:00
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implementation-profiles/profile.md
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@ -45,17 +45,17 @@ Test vector:
(Aligned with https://github.com/dirkx/DP-3T-Documents/tree/editable-version/impl/design-2-openssl-C) (Aligned with https://github.com/dirkx/DP-3T-Documents/tree/editable-version/impl/design-2-openssl-C)
The hash shall be a SHA256 (Note; given a reveal 60-90 bits - perhaps not so crucial). The key shall be the hash as resulting from 2020/4/12 version of the Whitepaper: H(TRUNCATE128(H(seed))||i). No further hasing is required.
Note - hash propably not needed - less than 20% exposed.
The key shall be 32 bytes which are used as follows: The key shall be 32 bytes which are used as follows:
byte 0..3 up to Z bits for the LSB of the Cuckoo hash byte 0..3 up to <bits-hash bits for the LSB of the Cuckoo hash
byte 4..7 up to Z bits for the MSB of the Cuckoo hash byte 4..7 up to <bits-hash bits for the MSB of the Cuckoo hash
byte 8.. up to `verifylimit' bytes. byte 8.. up to `<bits-verify>' bytes.
Where <Z> is the number of bits needed for the number of buckets (e.g Z=19 if the buckets are is 524288). Where <bits-hash> and <bits-verify> are set as low as is feasible given the acceptable false positive rates.
Where verify limit is set as low as is feasible given the acceptable false positive rates.
The Cuckoo filter shall be serialised as: The Cuckoo filter shall be serialised as:
@ -80,11 +80,11 @@ Followed by
With the partial hash being limited to the number of bits needed for N buckets. With the partial hash being limited to the number of bits needed for N buckets.
And with the Hash So this, 1.0, version of the serialisation does not pack the bits; both hashes are padded to the a full byte.
### Cuckoo filter publication ### Cuckoo filter publication
The filter should be published prefixed by an RFC3161 timestamp. The filter should be published prefixed by a RFC3161 timestamp.