Image encrypted system using scan patterns and 2-D cellular automata

This work presents a new image encrypted system. Its encryption method is based on permutation of the pixels of the image and replacement of the pixel values. The permutation is done by scan patterns generated by the SCAN methodology. The pixel values are replaced using a progressive cellular automata (CA) substitution. The proposed image encryption method satisfies the properties of confusion and diffusion due to the CA substitution and is wonderful. The characteristics of the proposed image encryption method are: loss-less, symmetric private key encryption, very large number of security keys ( the number of possible security keys is large than 10/sup 9536/), key-dependent permutation, and key-dependent pixel value replacement. Simulation results for gray images show that the proposed image encrypted system works well as expected.