arc4 arc4 random number generator Very quick high quality 32-bit pseudo-random number generator. This code is derived from section 17.1 of Applied Cryptography, second edition, which describes a stream cipher allegedly compatible with RSA Labs "RC4" cipher (the actual description of which is a trade secret). The same algorithm is used as a stream cipher called "arcfour" in Tatu Ylonen's ssh package. Dmitri Alenichev 6e03cac0c0f09c185451543e67952e6cd2bc45b4 0.1