Abstract: A cryptography system based on two dimension toggle cellular automata was proposed to solve the slowness of encryption and decryption based on one dimension toggle cellular automata. The encryption and decryption of data is completed by the co-evolution of the cellular automata. The key space can be adjusted by changing the neighborhood radins and the rounds of encryption. The analysis results show that the cryptosystem can resist brute attack and differential attack, and also has high security. The hardware shared by encryption and decryption made the cryptosystem to have a strong practicability.

Key words: Toggle cellular automata, Data encryption, Reversible rule