混沌掩码耦合复数模型的彩图RGB同步加密算法  

Synchronous encryption algorithm for multi-image based on plural model coupled chaotic mask

作　　者：张智高[1] 张红梅[2] 裴志利[2] 

机构地区：[1]内蒙古民族大学数学学院,内蒙古通辽028000 [2]内蒙古民族大学计算机科学与技术学院,内蒙古通辽028000

出　　处：《计算机工程与设计》2015年第8期2058-2063,共6页Computer Engineering and Design

基　　金：国家自然科学基金项目(61163034;61373067);内蒙古自然科学基金项目(2013MS0911);内蒙古民族大学科学研究基金项目(NMD1231)

摘　　要：当前彩图加密算法都是对其R、G、B分量进行独立加密,属于多通道加密机制,增大了传输延迟;而现有单通道彩图加密算法主要采取频谱切割与压缩思想,忽略了图像高频成分,易产生较大失真。为此,提出混沌掩码耦合迭代复数模型的单通道彩图RGB同步无损加密算法。引入DCT(discrete cosine transform)与ZigZag扫描,将提取的RGB分量演变为3个矩阵;设计迭代复数模型,形成复数矩阵;借助Logistic映射扰乱其实部与虚部;通过IDCT(inverse discrete cosine transform)机制,形成复合图像;结合混沌掩码,构造双重加密函数,获取密文。仿真结果表明,与当前彩图加密机制相比,该算法无失真,解密质量更高且高度安全。The current color image encryption algorithms independently encrypt the RGB components, which belong to multi- channel encryption mechanism, resulting in big transmission delay. Existing single channel color image encryption algorithms mainly adopt the spectrum cutting technology, which ignores the high frequency component of image and produces the crosstalk effect. To solve these problems, single channel color image synchronous lossless encryption algorithm for RGB components based on plural model coupled chaotic mask was proposed. The DCT transform and ZigZag scanning were introduced to trans- form RGB components into three matrixes. These matrixes were taken into composite matrix by using the iteration image plural model. The position between real and imaginary parts of plural matrix is permutated using Logistic map. The composite permu- tation image was formed using the II）ZT. The double encrypt function was constructed with chaos phase mask to get the gray ci- pher. Simulation results show that this encryption algorithm is highly secure. Compared with current algorithms, this algorithm has lossless distortion and its decryption quality is high.

关 键 词：彩色图像无损加密 迭代复数模型 复数矩阵 RGB分量 混沌掩码 串扰效应 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]