full-disclosure - Re: password hash

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Message-Id: <20071005173933.DF1D7C381C@mailserver10.hushmail.com>
Date: Fri, 05 Oct 2007 13:39:33 -0400
From: <full-disclosure@...hmail.com>
To: <admin@...ntrac.com>,<valdis.kletnieks@...edu>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: password hash

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Wow Vladis shut the fuck up

On Fri, 05 Oct 2007 10:35:36 -0400 Valdis.Kletnieks@...edu wrote:
>On Thu, 04 Oct 2007 22:22:14 EDT, Brian Toovey said:
>> Does anyone know what kind of password hash this is?
>> 'password1' =
>> &c6;Ub&c3;&ab;&19;a&cf;&86;
>
>Hex format would be less likely to be mis-parsed.  I'm *guessing*
>you
>mean the hash is x'c65562c3 ab1961cf 86' - which is slightly odd,
>being
>72 bits long.  A salted 64-bit hash, perhaps?  Or it might be some
>home-grown
>hash that somebody invented.
>
>If you know what 'password1' hashes to, it's time to do some
>differential
>cryptography and try hashing 'password2', 'password11',
>'passwor111', and so
>on, to determine how many input characters the hash considers.
>The next thing
>to try is hashing 'qassword1' (which has one bit different from
>'password1')
>and seeing how many of the output bits change, which will tell you
>the relative
>strength of the hash.  A good hash will have about half the bits
>change on a
>one-bit difference (and continuing through q, r, s, t and so on
>won't reveal
>any pattern of *which* bits change), while a bad hash will fail to
>cause a bit
>cascade and only a few bits will be different in the output.
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