From 89f776e6f333124c6f11db4932a64c7fc89acb3d Mon Sep 17 00:00:00 2001 From: Paul Schaub Date: Wed, 8 Nov 2023 15:24:44 +0100 Subject: [PATCH] Add line about well-formed-ness --- book/source/09-verification.md | 1 + 1 file changed, 1 insertion(+) diff --git a/book/source/09-verification.md b/book/source/09-verification.md index ae400f2..8691c74 100644 --- a/book/source/09-verification.md +++ b/book/source/09-verification.md @@ -20,6 +20,7 @@ A signature might be correct, but still disqualify as a valid signature. Put mathematically, the set of valid signatures is a subset of the set of correct signatures. The validity of a correct signature is additionally constrained by a number of conditions: +Signatures need to be well-formed, meaning they must contain required signature subpackets in the proper subpacket area and must not contain unknown critical subpackets or notations. Most signatures have a limited validity period, constrained by the signature creation- and expiration time. Furthermore, some signatures need to be *qualified* by another valid signature in order to be considered valid. Lastly, signatures can be invalidated by revocations.