关键词: 图像加密, Henon, 超混沌, MD5, 安全

Abstract: To enhance the security of image encryption algorithm in chaotic systems, a new algorithm based on the combination of MD5 and chaotic system was proposed. Allowing MD5 value of original image to participate in the initialization of Henon hyperchaotic system, the algorithm increased the sensitivity of original image and was much more complex than the ordinary system. In addition, the altered algorithm of binary code stream sequence generation could lead to dynamic change of block length so as to further disrupt the original characteristic of chaotic system and the packet characteristics of the code stream. This algorithm could resist chosen plaintext attack, differential attack and partition attack effectively, which has been verified by analysis and experiment.

Key words: image encryption, Henon, Hyperchaotic, MD5, security