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Date: Wed, 5 Dec 2007 03:21:56 +0300
From: Solar Designer <>
Subject: Re: PS3 MD5 cracking

On Tue, Dec 04, 2007 at 04:43:29PM +1300, Russell Fulton wrote:
> Reading the paper reports in local computerworld we found that when they
> quoted Nick directly he referred to md5 *cycles* per second.  My
> knowledge of md5 is hazy at best but iirc for each hash there are 64 of
> cycles.
> Does this make sense?

I'm afraid not.  In MD5, there are four "rounds", where each round
consists of 16 "steps", although the word "step" is only used in the part
of RFC 1321 that describes differences between MD4 and MD5.  No "cycles".

Moreover, it hardly makes sense to refer to the rate of MD5 rounds or
steps computed per second because the four rounds are different - and
they are even more different in implementations optimized (or cut down)
for cracking just one MD5 hash.  Even the number of steps to compute for
a given round may be reduced.

BTW, I incorrectly referred to the steps as rounds in my previous posting.

Alexander Peslyak <solar at>
GPG key ID: 5B341F15  fp: B3FB 63F4 D7A3 BCCC 6F6E  FC55 A2FC 027C 5B34 1F15 - bringing security into open computing environments

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