基于复合混沌系统的图像加密  

Image Encryption Based on Composite Chaotic System

作　　者：彭军[1] 廖晓峰[2] 张伟[3] 李学明[2] 刘勇国[4] 王莅辉[5] 

机构地区：[1]重庆科技学院电子信息工程学院,重庆400050 [2]重庆大学计算机科学与工程学院,重庆400044 [3]重庆教育学院计算机与现代教育技术系,重庆400067 [4]上海交通大学计算机科学与工程系,上海200030 [5]北京石油化工学院计算机系,北京102600

出　　处：《计算机工程》2006年第2期34-36,共3页Computer Engineering

基　　金：国家自然科学基金资助项目(60271019);教育部博士点专项基金资助项目(20020611007);重庆市科委自然科学基金资助项目(CSTC;2005BB2050);重庆工业高等专科学校科研基金资助项目

摘　　要：研究了一个基于复合混沌系统的图像加密系统。在该加密系统中,使用具有复杂动力学特性的三维Chen系统和一维Logistic混沌映射,并以特定方式将两个混沌系统的输出序列复合起来,通过异或操作实现了对图像的快速加密处理。对该系统进行数值实验和安全性分析,结果表明该系统不但拥有大的密钥空间,而且对密钥和明文很敏感,具有优良的扩散性能和扰乱性能,并能抵抗已知明文攻击和选择明文攻击。This paper proposes an image encryption system based on composite chaotic system. A three dimensional Chen＇s system which has a complex dynamical behavior and a one dimensional logistic chaotic mapping are employed in the encryption system. The output sequences of these two chaotic systems are composed by using a special method, and a fast image encryption is realized by means of the bit wise xor operations. The results of simulation experiments and security analyses indicate that this encryption system not only has a large key space but also has a very sensitivity with respect to the secret key and the original image. The encryption system proposed in this paper possesses perfect diffusion and confusion properties and it can resist the know-plaintext attacks and chosen-plaintext attacks.

关 键 词：复合混沌系统 图像加密 CHEN系统 LOGISTIC映射 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]