基于随机混沌序列的图像加密算法  

An Image Encryption Scheme Based on Random Chaotic Sequence

作　　者：杨华千[1] 张伟[2] 韦鹏程[1] 黄松[2] 

机构地区：[1]重庆大学计算机学院,重庆400044 [2]重庆教育学院计算机与现代教育技术系,重庆400067

出　　处：《计算机科学》2006年第10期205-209,共5页Computer Science

基　　金：重庆市教委资助项目(No.KJ061501;No.KJ051501);重庆市科委资助项目(No.CSTC;2005BB2286)。

摘　　要：混沌系统的参数敏感性、初值敏感性和以同一分布遍历各态的特性很好地对应了密码系统应具备的一些基本特性。本文提出了一种基于随机混沌序列的图像加密算法。在该算法的图像像素的空间置乱过程中,采用了离散的标准映射混沌系统。而在像素的扩散过程中,通过复合离散混沌系统隐藏了混沌序列产生时所经历的迭代次数。理论分析和仿真实验表明,本文提出的算法具有较高的安全性能,特别是在统计攻击、差分攻击和选择明文攻击能力方面具有很好的抗攻击性能。The chaotic properties of chaotic system such as ergodicity, mixing and sensitive dependence on initial conditions and system parameters, are corresponding with some important properties of cryptosystems. In the paper, an image encryption algorithm based on random chaotic sequence is presented. In the spatial permutation process, a discrete standard map is employed. When the chaos sequence, which is used to diffuse the pixels of the image, is generated, the iteration times are hidden to avoid cryptanalysis based on symbolic dynamic. Theoretical analyses and simulated experiment show that, the proposed algorithm has excellent performances against attacks, in particular statistical attack, differential attack and chosen plain image attack.

关 键 词：混沌图像加密算法 标准映射 复合离散混沌系统 选择明文攻击 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]