基于TD-ERCS混沌序列的数字图像置乱方法  

Schema for digital image scrambling based on TD-ERCS chaotic sequences

作　　者：尹立杰[1] 赵金辉[2] 段岩[1] 

机构地区：[1]中国地质大学(北京),北京100083 [2]石家庄经济学院,河北石家庄050031

出　　处：《计算机工程与设计》2008年第18期4853-4855,共3页Computer Engineering and Design

基　　金：河北省科技厅基金项目(052135148);石家庄经济学院基金项目(XN200719)

摘　　要：TD-ERCS是专门为混沌加密理论而设计的混沌系统,不存在由短周期引发的弱密钥,具有良好的安全特质。置乱是大数据量级的数字图像保护措施之一。算法利用TD-ERCS离散混沌序列生成地址索引表针对像素地址进行单向置乱,由序列产生密钥对图像的直流分量进行数学变换。空域与频域相结合增强系统复杂度和安全性,同时避免了一密多用和多密钥的传输,增强了系统的强度。TD-ERCS is a special chaotic system devised for the chaotic encryption theory. The tangent-delay operation on the physical model of ellipse reflecting cavity is proposed to change the evolution route of the system, and a new class of discrete chaotic map system is deduced. The chaotic sequences meet the security characteristics of chaotic systems without weak key which is generated by weak period. Scrambling operation is one of protected methods for digital image. This schema is an image chaotic algorithm with shuffling the positions and changing the energy of the image. An address index list could be created by the discrete TD-ERCS chaotic sequences to scramble the positions of the image pixels in the spatial domain by one-way, meanwhile, keys could be computed to transform the DC coefficients of the image which avoid changing the grey values of pixels one by one. The combined algorithm not only enhances the system complexity and security, but also avoids the iterative application of one key and the transmission of multi-key.

关 键 词：混沌 TD—ERCS 图像 置乱 保护 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]