基于广义猫映射的一种图像加密系统  

An image cryptosystem based on general cat map

作　　者：马在光[1] 丘水生[1] 

机构地区：[1]华南理工大学电子与通信工程系,广东广州510641

出　　处：《通信学报》2003年第2期51-57,共7页Journal on Communications

基　　金：国家自然科学基金资助项目(69672022);教育部高校博士点基金资助项目(00056107)

摘　　要：本文首先将猫映射推广为广义猫映射,然后将图像的像素坐标和灰度作为广义猫映射的初始值,映射参数和迭代次数作为密钥,对图像进行加密。本加密方案具有置换、替代、扩散等加密系统的基本要素,能抗明文攻击和选择明文攻击,密钥长度可变,密钥空间巨大,密文和明文大小可变且相同,计算时间也较短,可用于图像和数据块加密后传输。In this paper we first extend the cat map to 揼eneral cat map? then, taking the pixel抯 location and gray level as the initial condition, and the parameters and iteration number as the keys, we apply the general cat map to encrypt the image. Our system contains permutation, substitution and diffusion, which are necessary factors for a good cryptosystem. It is resistive to known plain-text type of attack and chosen plain-text type of attack. It抯 advantages include variable key length and variable image (data block) size, very huge key set, cipher-text with the same size as plain-text, both fast encryption and decryption process.

关 键 词：广义猫映射 混沌通信 猫映射 图像加密 互联网 

分 类 号：TN918.8[电子电信—通信与信息系统] TP393.4[电子电信—信息与通信工程]