一种基于复合混沌系统变参数图像加密新算法  

A novel encryption scheme based on the composite chaotic system

作　　者：王斌斌[1] 张妍琰[1] 吴长泽[2] 

机构地区：[1]河南城建学院计算机科学与工程系,河南平顶山467036 [2]重庆大学计算机学院,重庆400044

出　　处：《河南理工大学学报（自然科学版）》2012年第6期717-721,共5页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(90818028);河南省重点科技攻关项目(102102210020)

摘　　要：基于变参数的复合混沌系统,提出了一种图像加密新算法.首先,根据一维Logistic映射选择自身的系统参数,并结合三维混沌系统,构造一种非线性耦合函数来对明文进行置乱.其次,根据明文信息和混沌序列,对每一次置乱后的像素点进行像素灰度变换.这样,算法便具有密码学所需的置乱、随机等特性.仿真实验和安全性分析表明,该加密算法加密效果良好,密钥空间较大,并有良好的统计特性,可以有效地抵御穷举攻击、差分攻击以及选择明文攻击等.Based on compound chaotic systems with variable control parameters, a novel image encryption scheme is proposed. Firstly, the system parameter of the Logistic map is chosen according to the map itself and a nonlinear coupled function is constructed with a 3D chaotic system to scramble the pixels of the plain- text. At the same time, gray-level transformation is operated after each round of scrambling according to the chaotic sequences and plaintext. Hence, the proposed algorithm owns the characteristics necessary for crypto- system such as confusion and diffusion, etc. Simulation experiments and the security analysis indicate that the proposed scheme has a large key space together with excellent statistical properties, and can resist exhaustive attack, differential attack and ehosen-plaintext attack, etc.

关 键 词：变参数 图像加密 LOGISTIC映射 安全性分析 差分攻击 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]