Image Encryption and Decryption Using Cellular Automata

This paper presents new image encryption and decryption method using cellular automata. This method is based on the replacement of the pixel values. Such replacement is made using recursive data reformation and recursive cellular automata (CA)substitution .Data are reformed using data reformation key, while CA substitution is performed using CA key and cellular programming.Cellular programming dynamically chose best rules (which produce better random number sequence).CA key decide initial configuration and boundary condition of 2D Von Neumann cellular automata.CA key also help to chose a particular key stream sequence(i.e a sequence of CA data)from total produced key space(i.e total CA data sequence). The salient features of the proposed method are its losslessness, symmetric private key encryption, very large number of secret keys, and key-dependent pixel value replacement.