full-disclosure - Re: Chinese Professor Cracks Fifth Data Security Algorithm (SHA-1)

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Date: Sat, 24 Mar 2007 11:48:10 -0500
From: wac <waldoalvarez00@...il.com>
To: "Blue Boar" <BlueBoar@...evco.com>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>,
	3APA3A <3APA3A@...urity.nnov.ru>, Secure Coding <SC-L@...urecoding.org>
Subject: Re: Chinese Professor Cracks Fifth Data Security
	Algorithm (SHA-1)

Of course not, is enough to find a collision and you'll get for example a
message signed by somebody else that looks completely authentic since
signatures encrypt that hash with the private key.

On 3/21/07, Blue Boar <BlueBoar@...evco.com> wrote:
>
> 3APA3A wrote:
> > First,  by  reading  'crack'  I thought lady can recover full message by
> > it's signature. After careful reading she can bruteforce collisions 2000
> > times faster.
>
> Cracking a hash would never mean recovering the full original message,
> except for possibly messages that were smaller than the number of bits
> in the hash value. There are an infinite number of messages that all
> hash to the same value.
>
> The best crack you can have for a hash is to be able collide with an
> existing hash value and be able to choose most of the message contents.
>
>                                         BB
>
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