 In cryptography, he designed with Eli Biham the BEAR, LION and Tiger cryptographic primitives, and co-wrote with Biham and Lars Knudsen the block cipher Serpent, one of the finalists in the Advanced Encryption Standard (AES) competition.He has also discovered weaknesses in the FISH cipher and designed the stream cipher Pike.Anderson has always campaigned for computer security to be studied in a wider social context.