Re: Performance: MD4 vs MD5

On Friday, April 25, 2003, at 04:19 PM, Michael wrote:

>> Where did you read that collisions with MD4 are that frequent?
>> I'm aware of cryptographic attacks against the first few rounds
>> but do not recall reading _anything_ that states MD4's collision
>> rate is that low.
> ^^^
>
> Er, make that "high" :)
"Dobbertin has shown how collisions for the full version of MD4 can be
found in under a minute on a typical PC. Clearly, MD4 should now be
considered broken."

If you want collision rates, see
http://www.cs.duke.edu/~anderson/hashing/

If you do a google search on "md4 collision rate", you'll see things
like "(S/Key was originally just MD4, which proved to have a high
collision rate)"
Also see http://burtleburtle.net/bob/hash/doobs.html

Note that table shows that a simple dictionary of 38740 english words
is enough to generate a collision in MD4.
--Dan

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Received on Fri Apr 25 23:11:21 2003