A SOFTWARE-OPTIMIZED ENCRYPTION ALGORITHM

We describe the software-efficient encryption algorithm SEAL 3.0. Comp utational cost on a modern 32-bit processor is about 4 clock cycles pe r byte of text. The cipher is a pseudorandom function family: under co ntrol of a key (first preprocessed into an internal table) it stretche s a 32-bit position index into a long, pseudorandom string. This strin g can be used as the keystream of a Vernam cipher.