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On Mon, Nov 03, 2014 at 09:08:53 +0000, Patrick Schleizer wrote:
> Linus Torvalds said: [1]
>>> Git uses SHA-1 not for security
>> And goes on.
>>> The security parts are elsewhere
>> Could you please elaborate on this? Where are the security parts? Can
> you please briefly explain how these work? Where can I read more about this?
This would be a better question for the git mailing list.
Afaik, the only "security" that existed at the time he wrote that would
have been GPG-signed tags (and today, the only additional would be
GPG-signed commits). But I could be mistaken.
> Wikipedia says. [2]
>>> Nonetheless, without second preimage resistance [3] of SHA-1 signed
> commits and tags would no longer secure the state of the repository as
> they only sign the root of a Merkle tree [4].
Correct.
> Which contradicts what Linus Torvalds said. What does that mean for
> security? Which statement is true?
My assumption is that he relies (or relied) upon the integrity of
SHA-1. As I mentioned in the Horror Story, he mentioned that he need
only remember the SHA-1 of the tip of his branch to rest assured that
the copy of a repository is identical to his own.[0] But it'd be worth
asking him or someone on the mailing list.
> If (!) I understand Mike Gerwitz ([...] GNU [...]) 's opinion, his
> opinion is, that for best security each and every commit should be
> signed for best possible git verification security.
> [...]
> - Verbose reply by Mike Gerwitz to my question. [8]
Sure, but I don't sign every commit personally in practice. I won't
repeat what I said in [8] here, though.
[0] http://mikegerwitz.com/papers/git-horror-story
> [8] /forum/index.php/topic,538.msg4278.html#msg4278
- --
Mike Gerwitz
Free Software Hacker | GNU Maintainer
http://mikegerwitz.com
FSF Member #5804 | GPG Key ID: 0x8EE30EAB
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