Re: password hash

[Nikolay Kichukov <hijacker () oldum net>]

Nice explanation Vladis, thanks!

Cheers,
-Nikolay

full-disclosure () hushmail com wrote:
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> Wow Vladis shut the fuck up
>
> On Fri, 05 Oct 2007 10:35:36 -0400 Valdis.Kletnieks () vt 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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