Cellular Automata Based Cryptosystem (CAC)

This paper introduces a Cellular Automata (CA) based symmetric key cryptosystem for block cipher. The scheme named as CAC (Cellular Automata based Cryptosystem) employs a series of transforms - simple, moderately complex, and complex - all generated with different classes of CA. CAC provides a low cost, high speed cryptosystem with desired level of security. Cryptanalysis of the proposed scheme is reported along with similar analysis for two popular systems - DES and AES. Experimental results confirm that the security of the system is significantly better than DES and comparable to that of AES. The encryption/ decryption throughput is higher than that of both AES and DES.