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doc: Document summary values of TOFU_STATS

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Signed-off-by: Andre Heinecke <aheinecke@intevation.de>
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Andre Heinecke 2017-01-06 12:26:01 +01:00
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@ -761,6 +761,19 @@ pkd:0:1024:B665B1435F4C2 .... FF26ABB:
takes on value 0. Instead, if there is a conflict, VALIDITY still
reflects the key's validity (values: 1-4).
SUMMARY values use the euclidean distance (m = sqrt(a² + b²)) rather
then the sum of the magnitudes (m = a + b) to ensure a balance between
verified signatures and encrypted messages.
Values are calculated based on the number of days where a key was used
for verifying a signature or to encrypt to it.
The ranges for the values are:
- 1 :: signature_days + encryption_days == 0
- 2 :: 1 <= sqrt(signature_days² + encryption_days²) < 8
- 3 :: 8 <= sqrt(signature_days² + encryption_days²) < 42
- 4 :: sqrt(signature_days² + encryption_days²) >= 42
SIGN-COUNT and ENCRYPTION-COUNT are the number of messages that we
have seen that have been signed by this key / encryption to this
key.