17 Dec
2003
17 Dec
'03
11:17 p.m.
Mike Johnson second login says:
Don't forget the precomputation attack. The key setup only has to be done 2^40 times, ever. The initial state of the stream cipher can be stored on a set of tapes that are read in parallel to perform the brute force attack.
You may be interested to know that the SPA/NSA agreement covered this; you are allowed to use a 40 bit "salt" thats appended to the key when you use RC4 in an exported application provided the salt is sent along with the message. .pm