MD5 collisions in one minute

Max maxale at
Fri Mar 17 19:39:11 EST 2006

On 3/17/06, Weger, B.M.M. de <b.m.m.d.weger at> wrote:

> You might be interested in knowing that my MSc student
> Marc Stevens has found a considerable speedup of MD5
> collision generation. His improvements of Wang's method
> enables one to make MD5 collisions typically in one
> minute on a PC; sometimes it takes a few minutes, and
> sometimes only a few seconds.
> His paper (shortly to appear on the Cryptology ePrint
> Archive) can be found on,
> where we've also made his software available (source code
> and a Win32 executable).

Thanks for interesting info!

btw, do you aware of another MD5 Collisions generating software
(requiring ~45 minutes per collision) available at
I did not find any references to it in Marc's website/paper.


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