Abstract:

With analysis and comparison of several chaotic systems generally applied on image encryption, the Henon map is proposed for image encrypting. Owing to the non-uniform distribution of sequence generated by Henon map, Wang Ying’s method is adopted, which lateralizes the decimal point to right direction and clips the integer part. The lateral parameter of Wang Ying’s method is limited in the treatment of chaotic sequence as to get a more suitable pseudo-random sequence in the progress of image encryption. Then a transfer matrix and a confusion matrix is used, which are generated by the pseudo-random sequence to exclusive or the bits of the pixels and scramble the location of image. Simulation results indicate that the algorithm can reach a better effect in image encryption and have strong anti-attacking performance.

Key words: chaos, chaos encryption, image encryption, pseudo-random sequence