应用Henon超混沌系统改进的图像加密

为提高混沌系统图像加密的安全性，提出了一种结合MD5信息摘要的混沌图像加密算法。新算法使明文的信息摘要值参与Henon超混沌系统的初始化，增强了明文的敏感性，也比一般的混沌系统更具复杂性。同时，改进的二进制密码流序列生成算法导致分组长度动态变化，进一步扰乱了混沌系统的原有特性及密码流的分组特征。理论分析和实验说明算法能有效地抵御选择明文攻击、差分攻击和分割攻击。

Improved image encryption algorithm based on Henon hyperchaotic system

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.