关键词: 图像加密, 级联混沌, 像素置乱, 多轮加密

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