From: Jason Cooper <jason@lakedaemon•net>
To: Jonathan Nieder <jrnieder@gmail•com>
Cc: Junio C Hamano <gitster@pobox•com>,
Shawn Pearce <spearce@spearce•org>,
Linus Torvalds <torvalds@linux-foundation•org>,
Git Mailing List <git@vger•kernel.org>,
Stefan Beller <sbeller@google•com>,
bmwill@google•com, Jonathan Tan <jonathantanmy@google•com>,
Jeff King <peff@peff•net>, David Lang <david@lang•hm>,
"brian m. carlson" <sandals@crustytoothpaste•net>,
Masaya Suzuki <masayasuzuki@google•com>,
demerphq@gmail•com, The Keccak Team <keccak@noekeon•org>,
Johannes Schindelin <Johannes.Schindelin@gmx•de>
Subject: Re: [PATCH v4] technical doc: add a design doc for hash function transition
Date: Mon, 2 Oct 2017 19:41:27 +0000 [thread overview]
Message-ID: <20171002194127.GI31762@io.lakedaemon.net> (raw)
In-Reply-To: <20170929173413.GI19555@aiede.mtv.corp.google.com>
On Fri, Sep 29, 2017 at 10:34:13AM -0700, Jonathan Nieder wrote:
> Junio C Hamano wrote:
> > Jonathan Nieder <jrnieder@gmail•com> writes:
...
> > If it is a goal to eventually be able to lose SHA-1 compatibility
> > metadata from the objects, then we might want to remove SHA-1 based
> > signature bits (e.g. PGP trailer in signed tag, gpgsig header in the
> > commit object) from NewHash contents, and instead have them stored
> > in a side "metadata" table, only to be used while converting back.
> > I dunno if that is desirable.
>
> I don't consider that desirable.
>
> A SHA-1 based signature is still of historical interest even if my
> centuries-newer version of Git is not able to verify it.
Agreed, even a signature made by a now exposed and revoked key still has
validity. Especially in a commit or merge. We know it was made prior
to the key being compromised / revoked.
This is assuming that the keyholder can definitively say "Don't trust
signatures from this key after this date/time+0000". And the signature
in question is in the git history prior to that cut off.
Tags are a different animal because they can be added at any time and
aren't directly incorporated into the history.
thx,
Jason.
next prev parent reply other threads:[~2017-10-02 19:41 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-04 1:12 RFC: Another proposed hash function transition plan Jonathan Nieder
2017-03-05 2:35 ` Linus Torvalds
2017-03-06 0:26 ` brian m. carlson
2017-03-06 18:24 ` Brandon Williams
2017-06-15 10:30 ` Which hash function to use, was " Johannes Schindelin
2017-06-15 11:05 ` Mike Hommey
2017-06-15 13:01 ` Jeff King
2017-06-15 16:30 ` Ævar Arnfjörð Bjarmason
2017-06-15 19:34 ` Johannes Schindelin
2017-06-15 21:59 ` Adam Langley
2017-06-15 22:41 ` brian m. carlson
2017-06-15 23:36 ` Ævar Arnfjörð Bjarmason
2017-06-16 0:17 ` brian m. carlson
2017-06-16 6:25 ` Ævar Arnfjörð Bjarmason
2017-06-16 13:24 ` Johannes Schindelin
2017-06-16 17:38 ` Adam Langley
2017-06-16 20:52 ` Junio C Hamano
2017-06-16 21:12 ` Junio C Hamano
2017-06-16 21:24 ` Jonathan Nieder
2017-06-16 21:39 ` Ævar Arnfjörð Bjarmason
2017-06-16 20:42 ` Jeff King
2017-06-19 9:26 ` Johannes Schindelin
2017-06-15 21:10 ` Mike Hommey
2017-06-16 4:30 ` Jeff King
2017-06-15 17:36 ` Brandon Williams
2017-06-15 19:20 ` Junio C Hamano
2017-06-15 19:13 ` Jonathan Nieder
2017-03-07 0:17 ` RFC v3: " Jonathan Nieder
2017-03-09 19:14 ` Shawn Pearce
2017-03-09 20:24 ` Jonathan Nieder
2017-03-10 19:38 ` Jeff King
2017-03-10 19:55 ` Jonathan Nieder
2017-09-28 4:43 ` [PATCH v4] technical doc: add a design doc for hash function transition Jonathan Nieder
2017-09-29 6:06 ` Junio C Hamano
2017-09-29 8:09 ` Junio C Hamano
2017-09-29 17:34 ` Jonathan Nieder
2017-10-02 8:25 ` Junio C Hamano
2017-10-02 19:41 ` Jason Cooper [this message]
2017-10-02 9:02 ` Junio C Hamano
2017-10-02 19:23 ` Jason Cooper
2017-10-03 5:40 ` Junio C Hamano
2017-10-03 13:08 ` Jason Cooper
2017-10-04 1:44 ` Junio C Hamano
2017-09-06 6:28 ` RFC v3: Another proposed hash function transition plan Junio C Hamano
2017-09-08 2:40 ` Junio C Hamano
2017-09-08 3:34 ` Jeff King
2017-09-11 18:59 ` Brandon Williams
2017-09-13 12:05 ` Johannes Schindelin
2017-09-13 13:43 ` demerphq
2017-09-13 22:51 ` Jonathan Nieder
2017-09-14 18:26 ` Johannes Schindelin
2017-09-14 18:40 ` Jonathan Nieder
2017-09-14 22:09 ` Johannes Schindelin
2017-09-13 23:30 ` Linus Torvalds
2017-09-14 18:45 ` Johannes Schindelin
2017-09-18 12:17 ` Gilles Van Assche
2017-09-18 22:16 ` Johannes Schindelin
2017-09-19 16:45 ` Gilles Van Assche
2017-09-29 13:17 ` Johannes Schindelin
2017-09-29 14:54 ` Joan Daemen
2017-09-29 22:33 ` Johannes Schindelin
2017-09-30 22:02 ` Joan Daemen
2017-10-02 14:26 ` Johannes Schindelin
2017-09-18 22:25 ` Jonathan Nieder
2017-09-26 17:05 ` Jason Cooper
2017-09-26 22:11 ` Johannes Schindelin
2017-09-26 22:25 ` [PATCH] technical doc: add a design doc for hash function transition Stefan Beller
2017-09-26 23:38 ` Jonathan Nieder
2017-09-26 23:51 ` RFC v3: Another proposed hash function transition plan Jonathan Nieder
2017-10-02 14:54 ` Jason Cooper
2017-10-02 16:50 ` Brandon Williams
2017-10-02 14:00 ` Jason Cooper
2017-10-02 17:18 ` Linus Torvalds
2017-10-02 19:37 ` Jeff King
2017-09-13 16:30 ` Jonathan Nieder
2017-09-13 21:52 ` Junio C Hamano
2017-09-13 22:07 ` Stefan Beller
2017-09-13 22:18 ` Jonathan Nieder
2017-09-14 2:13 ` Junio C Hamano
2017-09-14 15:23 ` Johannes Schindelin
2017-09-14 15:45 ` demerphq
2017-09-14 22:06 ` Johannes Schindelin
2017-09-13 22:15 ` Junio C Hamano
2017-09-13 22:27 ` Jonathan Nieder
2017-09-14 2:10 ` Junio C Hamano
2017-09-14 12:39 ` Johannes Schindelin
2017-09-14 16:36 ` Brandon Williams
2017-09-14 18:49 ` Jonathan Nieder
2017-09-15 20:42 ` Philip Oakley
2017-03-05 11:02 ` RFC: " David Lang
[not found] ` <CA+dhYEXHbQfJ6KUB1tWS9u1MLEOJL81fTYkbxu4XO-i+379LPw@mail.gmail.com>
2017-03-06 9:43 ` Jeff King
2017-03-06 23:40 ` Jonathan Nieder
2017-03-07 0:03 ` Mike Hommey
2017-03-06 8:43 ` Jeff King
2017-03-06 18:39 ` Jonathan Tan
2017-03-06 19:22 ` Linus Torvalds
2017-03-06 19:59 ` Brandon Williams
2017-03-06 21:53 ` Junio C Hamano
2017-03-07 8:59 ` Jeff King
2017-03-06 18:43 ` Junio C Hamano
2017-03-07 18:57 ` Ian Jackson
2017-03-07 19:15 ` Linus Torvalds
2017-03-08 11:20 ` Ian Jackson
2017-03-08 15:37 ` Johannes Schindelin
2017-03-08 15:40 ` Johannes Schindelin
2017-03-20 5:21 ` Use base32? Jason Hennessey
2017-03-20 5:58 ` Michael Steuer
2017-03-20 8:05 ` Jacob Keller
2017-03-21 3:07 ` Michael Steuer
2017-03-13 9:24 ` RFC: Another proposed hash function transition plan The Keccak Team
2017-03-13 17:48 ` Jonathan Nieder
2017-03-13 18:34 ` ankostis
2017-03-17 11:07 ` Johannes Schindelin
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