一种基于随机密钥及“类标准映射”的图像加密算法  

An Image Encryption Algorithm Based on Random Key and "Quasi-Standard Map

作　　者：李昌刚[1] 韩正之[1] 张浩然[1] 

机构地区：[1]上海交通大学自动化系,上海200030

出　　处：《计算机学报》2003年第4期465-470,共6页Chinese Journal of Computers

基　　金：国家自然科学基金 (69874 0 2 5)资助

摘　　要：应用离散混沌动力系统设计了一种图像加密 /解密算法 .该文算法主要特点是 :无论从加密 /解密算法的设计到密钥的产生都是由不同的混沌动力系统提供的 .算法主要包括两部分 :(1 )采用依赖于随机密钥的非线性迭代变换来完成图像像素替代 ,其中所用的子密钥由离散混沌系统产生 ;(2 )采用“类标准映射”的强耦合结构来完成图像像素的置换 ,并且这种置换是依赖于密钥的 .替代和置换部分组成了具有良好密码特性的SP网络结构 .分析和仿真结果表明 ,经过这样的替代和置换 。This paper presents a new image encryption/decryption algorithm employing discrete chaotic systems. The main properties of the algorithm are that the whole encryption systems, including the encryption/decryption algorithm and the secret keys utilized are all generated by different chaotic systems. Two main modules are included in the algorithm. One is to substitute the pixels utilizing nonlinear iterative transformation which is dependent on the random secret keys generated by a discrete chaotic system. The other is to permute the pixels employing 'quasi standard map', which is a strong coupled architecture. The permutation is also dependent on the secret keys generated by a different chaotic system. The substitution and the permutation formed the SP network architecture with desirable cryptographic property. The analysis and the simulation results implied that the algorithm is of favorable security and efficiency.

关 键 词：图像加密算法 随机密钥 图像像素 类标准映射 数字图像加密算法 密码 保密通信 

分 类 号：TN918.1[电子电信—通信与信息系统] TP391.41[电子电信—信息与通信工程]