Re: [openpgp] New fingerprint: to v5 or not to v5
Peter Gutmann <pgut001@cs.auckland.ac.nz> Thu, 08 October 2015 15:17 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, 08 Oct 2015 15:16:50 +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>
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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: >Which is not defined by any standard. You don't need a standard to tell you that a SHA-1 hash of a certificate is obtained by taking a certificate and hashing it with SHA-1. Pretty much everything has supported this for years, typically under the name of certificate fingerprint. >It will only take a few days until the first wags create multiple different >keys with the same identifier to confuse software. X.509 has been using this mechanism for about twenty years without any problems. Sure, someone could do that, but what would they gain by it? The same wags could create a key with a colliding email address attached to it, and they've been able to do that for twenty years as well but the world hasn't ended because of it. >I call this corrupt data. The self-signature would not verify and thus the >key is unusable. Time to remember where you stored the backup. It's not corrupted, someone just updated their key info, the signatures on the new key data are all valid. The fact that the exact same key that was used earlier, with the exact same name/email address attached to it, now has a totally different identifier associated with it, is a problem with how PGP identifiers are handled. No data corruption has taken place. Peter.
- [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 vedaal
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 ianG
- Re: [openpgp] New fingerprint: to v5 or not to v5 Simon Josefsson
- Re: [openpgp] New fingerprint: to v5 or not to v5 Daniel Kahn Gillmor
- Re: [openpgp] New fingerprint: to v5 or not to v5 ianG
- Re: [openpgp] New fingerprint: to v5 or not to v5 Daniel A. Nagy
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: which hash algo (w… Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Watson Ladd
- Re: [openpgp] New fingerprint: to v5 or not to v5 Phillip Hallam-Baker
- Re: [openpgp] New fingerprint: which hash algo (w… Tom Ritter
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Mark D. Baushke
- Re: [openpgp] New fingerprint: to v5 or not to v5 Peter Gutmann
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Peter Gutmann
- Re: [openpgp] New fingerprint: to v5 or not to v5 ianG
- Re: [openpgp] New fingerprint: to v5 or not to v5 ianG
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: which hash algo (w… Simon Josefsson
- Re: [openpgp] New fingerprint: to v5 or not to v5 Peter Gutmann
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Peter Gutmann
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Peter Gutmann
- Re: [openpgp] New fingerprint: which hash algo ianG
- Re: [openpgp] New fingerprint: which hash algo vedaal
- Re: [openpgp] New fingerprint: which hash algo Steve Pointer
- Re: [openpgp] New fingerprint: which hash algo Alessandro Barenghi
- Re: [openpgp] New fingerprint: which hash algo Robert J. Hansen
- Re: [openpgp] New fingerprint: to v5 or not to v5 Daniel Kahn Gillmor
- Re: [openpgp] New fingerprint: to v5 or not to v5 Peter Gutmann
- Re: [openpgp] New fingerprint: to v5 or not to v5 Jonathan McDowell
- Re: [openpgp] New fingerprint: to v5 or not to v5 Nicholas Cole
- Re: [openpgp] New fingerprint: to v5 or not to v5 Vincent Breitmoser
- Re: [openpgp] New fingerprint: which hash algo Daniel A. Nagy
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: to v5 or not to v5 Peter Gutmann
- Re: [openpgp] New fingerprint: to v5 or not to v5 Watson Ladd
- Re: [openpgp] New fingerprint: to v5 or not to v5 Werner Koch
- Re: [openpgp] New fingerprint: which hash algo Phillip Hallam-Baker
- Re: [openpgp] New fingerprint: which hash algo ianG
- Re: [openpgp] New fingerprint: which hash algo Daniel Kahn Gillmor
- Re: [openpgp] New fingerprint: which hash algo Phillip Hallam-Baker