On Thu, Dec 13, 2001 at 05:29:32PM +0100, Marc Mutz wrote: > Cryptography isn't compatible with common sense. Read a good book about > it, then come back. Sorry. you wrote in another email > Birthday attack. Equal ciphertexts are being generated. Actually, the > boundary is 32G, but it's best to stay away from it. you mean books like handbook of applied cryptography[1] which explains that birthday attack doesnt have any boundary to 32Gbyte (square root of the space, 2^64 for blowfish). It is probabilistic and can occur with as few as two cipher text block (even it is less likely). The usual example 'if you have sqrt(n) block of n bit containing random value, the probability to have 2 blocks equal is 0.5' is an oversimplication to ease understanding. sincerely sorry to play this loosy game... 1. available for free at http://www.cacr.math.uwaterloo.ca/hac/ - Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/
