A novel image security system based on cellular automata and improved chaotic system

A novel image encryption scheme based on Cellular Automata and chaotic system is proposed in this paper. First, the chaotic sequences generated by Standard map are utilized to scramble the pixel matrix of plain image. Then according to cryptographic characteristics such as parallel computation and pseudorandom attribute, the pixel values of the scrambled image are transformed. Furthermore, encryption of different pixels depends on each other to diffuse the information of plain image. Simulation experiments and security analysis show that the proposed scheme has a large key space and is sensitive to secret keys, and the cipher image has excellent diffusion properties. Hence, the proposed scheme is of high security and can resist exhaustive attack, statistical attack and chosen-plaintext attack, etc.