??? 06/09/06 20:08 Modified: 06/09/06 21:06 Read: times |
#118121 - If anyone wants to play with it Responding to: ???'s previous message |
I have put a hardware implementation of the RC4 pseudo random number generator in the hardware library it can be used as it stands as a psbr or as the basis of a stream cipher by simply EXORing your plain/cipher text stream with the output of the rng.It produces a 20 bit pseudo random number every ten clock cycles and should fit into a cheapo CPLD. The stream cipher produced is pretty secure as long as you keep changing the keys regularly as the original cipher implemented in the 802.11 standard which is based on rc4 was suseptable to attack through the birthday paradox when the keys were not chaged on a regular basis.Have fun |