Re: [openpgp] New fingerprint: to v5 or not to v5

Peter Gutmann <pgut001@cs.auckland.ac.nz> Thu, 08 October 2015 15:52 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: Werner Koch <wk@gnupg.org>
Thread-Topic: [openpgp] New fingerprint: to v5 or not to v5
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Date: Thu, 8 Oct 2015 15:52:09 +0000
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References: <878u84zy4r.fsf@vigenere.g10code.de> <87fv1xxe5w.fsf@alice.fifthhorseman.net> <87r3lgcup8.fsf@vigenere.g10code.de> <CACsn0c=-LKagSqTbgOV1W4Gu4u-f6vpVq82-nWSLGogjoeFKeg@mail.gmail.com> <CAMm+LwjeKDKnN2ZAisbKhWVS4kwCEm_VvcZ1MtftYzEJQpGdhg@mail.gmail.com> <87y4fi5wa9.fsf@vigenere.g10code.de> <9A043F3CF02CD34C8E74AC1594475C73F4B278ED@uxcn10-5.UoA.auckland.ac.nz> <8737xp5z45.fsf@vigenere.g10code.de> <9A043F3CF02CD34C8E74AC1594475C73F4B279C6@uxcn10-5.UoA.auckland.ac.nz> <87fv1o4e9n.fsf@vigenere.g10code.de> <9A043F3CF02CD34C8E74AC1594475C73F4B2C5EE@uxcn10-5.UoA.auckland.ac.nz> <87wpuy1njl.fsf@vigenere.g10code.de> <9A043F3CF02CD34C8E74AC1594475C73F4B2D5B1@uxcn10-5.UoA.auckland.ac.nz>, <87bnc91i5y.fsf@vigenere.g10code.de>
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Cc: Watson Ladd <watsonbladd@gmail.com>, Phillip Hallam-Baker <phill@hallambaker.com>, Daniel Kahn Gillmor <dkg@fifthhorseman.net>, IETF OpenPGP <openpgp@ietf.org>
Subject: Re: [openpgp] New fingerprint: to v5 or not to v5
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Werner Koch <wk@gnupg.org>; writes:

>You mean the binding signatures verify okay but the key is different? If that
>is the case you found a bug in the software.  You can't change the creation
>date, the key material, the user id or the hashed signature subpackets
>without invalidating the corresponding self-signature.

There's no bug in the software, someone took the key (that's the key data, not
a complete copy of the original keyring packets with their signatures) and
wrote it out to a new keyring with a new date.  Same key, same userID,
different date (because it was written at a different time than before), new
signatures covering everything.  There are no bugs and no corruption, but the
implicitly-calculated key ID has changed because the datestamp has changed.

Peter.