[RC5] Challenge?

rc5 at amazing.ch rc5 at amazing.ch
Fri Jul 3 05:37:00 EDT 1998

Hi Jim

On Jun 29 Jim C. Nasby (nasbjim at charlie.cns.iit.edu) wrote:

> Well, if you look at their specs, they use a variable length 700-1200 bit
> key. So, unless decrypting their stuff is at least some 400 times faster than
> RC5-64, forget it.

That is only valid if you imply a brute force attack...

> Plus, I don't know if they give you any clue as to the
> message content, like RSA does with their contests.

The say, it's a ziped file, so it should contain a known header.


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