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Re: Chinese Professor Cracks Fifth Data Security Algorithm (SHA-1)
From: Blue Boar <BlueBoar () thievco com>
Date: Wed, 21 Mar 2007 10:53:27 -0700

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.


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