Ronald Rivest Creates RC4

Ronald Rivest creates RC4, or "Rivest Cipher 4". RC4 generates a pseudorandom stream of bits which for encryption, is combined with plaintext using XOR. To generate the keystream, the cipher makes use of a secret internal state containing a permutation of all 256 bites and two 8 bit index pointers. The permutation is initialized with a variable length key and generated using PRGA.