基于混合混沌与扩展ZigZag的图像置乱算法  

Image scrambling algorithm based on mixed chaotic systems and extended ZigZag transformation

作　　者：董虎胜[1] 陆萍[1] 马小虎[2] 

机构地区：[1]苏州经贸职业技术学院信息系,江苏苏州215009 [2]苏州大学计算机科学与技术学院,江苏苏州215021

出　　处：《计算机工程与设计》2011年第4期1241-1245,共5页Computer Engineering and Design

基　　金：江苏省自然科学基金项目(BK2007050)

摘　　要：在分析了标准ZigZag变换的缺点后对其进行改进,提出了一种基于混合混沌系统与扩展ZigZag变换相结合的图像置乱算法。为避免单一混沌系统存在的"平凡密钥"现象,算法采用Logistic映射与Chebyshev映射按周期交替迭代的方式生成混合混沌序列,并利用其对原始图像按扩展ZigZag扫描后的一维序列中各元素加密,在恢复为二维图像后完成置乱。该算法具有运算量小、密钥空间大、可迭代及可适用于非方阵图像等优点,仿真实验结果表明,该算法具有良好的图像置乱效果与较强的抗干扰能力。The standard ZigZag transformation rule is improved after analyzing its defects,and an image scrambling algorithm based on mixed chaotic systems with extended ZigZag transformation is proposed.In order to avoid the ＂invalid keys＂ of single chaotic system,mixed chaotic sequence is generated by maps of Logistic and Chebyshev with alternative iteration.The original image is trans-formed into a vector by extended ZigZag scanning first,then the items are encrypted by chaotic sequence,the scrambling is completed after 2-D image reformed.The algorithm has the following advantages： small computing amount,large key space,iterable,non-square image available.The experimental results show that the algorithm has good image scrambling effect and fine anti-attack capability.

关 键 词：混沌系统 扩展ZigZag变换 图像置乱 平凡密钥 迭代 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]