Abstract: This paper analyses the current color image encryption algorithm based on chaotic system. In the process of color image chaos encryption, security is not perfect, and on this basis it puts forward a new kind of multiple pixel scrambling based on cascade chaotic color image encryption algorithm. The algorithm adopts the composite of discrete chaotic system of the cascade of Kent-Logistic chaos and Henon, and combined with Arnold mapping and pixel permutation cutting of multiple pixel scrambling method, makes the image pixel value and pixel position scrambling diffusion, so as to achieve clear image information hiding ciphertext effect completely. Simulation experiments show that the algorithm not only can effectively resist choose clear （ciphertext） attack, statistical characteristics analysis, differential attack, but also has the advantages of good encryption effect and large key space.

Key words: image encryption, cascading chaotic, pixel scrambling, several rounds encryption

摘要： 分析了目前基于混沌系统的彩色图像加密算法，其中发现在混沌彩色图像加密过程中安全性方面的不完善，并在此基础上提出了一种新型的基于级联混沌的多重像素置乱彩色图像加密算法。该算法采用了Kent-Logistic的级联混沌与Henon离散混沌的复合系统，同时结合Arnold映射和像素排列切割的多重像素置乱方法，使得图像像素值和像素位置全盘置乱扩散，从而达到明文图像信息完全隐藏的密文效果。仿真实验表明，该算法不仅能有效抵抗选择明文（密文）攻击、统计特性分析、差分攻击，而且还具有加密效果好、密钥空间大等优点。

关键词: 图像加密, 级联混沌, 像素置乱, 多轮加密