关键词: 广义Henon映射, 图像加密, 广义猫映射, 混沌序列

Abstract: In order to improve the performance of chaotic image encryption, a new hybrid chaotic encryption algorithm based on generalized cat map is proposed. It uses the generalized cat mapping to iterate over the pixels firstly, and then uses the generalized cat map to make multiple scrambling. The number of scrambling is closely related to the pixel value of the image itself. Then the chaotic sequences generated by the generalized Henon map are used to encrypt the image. The results of experiment and simulation show that the algorithm can overcome the flaws of the previous algorithm which can not resist chosen plaintext（ciphertext） attacks, and can effectively solve the problems of chaotic system in poor randomness, entropy attack and less control parameters. At the same time, the algorithm has the advantages of large key space, simple encryption algorithm, better resistance to differential attack, statistical characterization, and has high security, good encryption effect.

Key words: generalized Henon maps, image encryption, generalized cat map, chaotic sequence