基于TD-ERCS混沌系统的图像加密方法  

Image encryption scheme based on TD-ERCS

作　　者：袁益民[1] 盛利元[1] 尚芳[1] 

机构地区：[1]中南大学物理科学与技术学院,长沙410083

出　　处：《计算机应用》2008年第4期906-909,共4页journal of Computer Applications

基　　金：国家自然科学基金资助项目(60672041)

摘　　要：提出了一种基于切延迟椭圆反射腔映射系统(TD-ERCS)的图像加密方法,通过一组64bit的外部密钥和一个TD-ERCS混沌系统来实现。混沌系统根据外部密钥产生一组值域在[-1,1]的随机数,这个区间被分为32个部分并对应8种加密运算方式,像素每次的加密操作由当前随机数所对应的加密运算方式决定。在加密完24个像素之后,密钥被修改。该方案设计简单,能够实现任意大小图像的加密,数值实验和性能分析证明其对于一些分析、攻击方式具有很高的安全性。A new image encryption scheme based on Tangent-Delay Ellipse Reflecting Cavity-map System （TD-ERCS） was proposed. In the proposed scheme, an external secret key of 64-bit and a TD-ERCS were employed. The initial condition for the TD-ERCS were derived using the external secret and then random numbers in [ - 1, 1 ] were generated, The range [ - 1, 1 ] was divided into 32 non-overlapping intervals and arranged into eight different groups. Further, eight different types of operations were used to encrypt the pixels of an image and one of them was used for a particular pixel decided by the outcome of the TD-ERCS. After encrypting each block of 24 pixels of the image, the secret key was modified. The simply designed encryption scheme can work on digital image at any size, while its high security to certain analysis and attack method is proved by statistical analysis and key sensitivity tests.

关 键 词：图像加密 切延迟椭圆反射腔映射系统 混沌密码学 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]