基于格雷码和混沌系统的图像加密算法  

Image Encryption Algorithm Based on Gray Code and Chaotic System

作　　者：薛伟[1] 吕群 XUE Wei;LYU Qun(School of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China)

机构地区：[1]江南大学物联网工程学院,无锡214122

出　　处：《计算机系统应用》2018年第7期177-181,共5页Computer Systems & Applications

基　　金：国家自然科学基金(61374047)~~

摘　　要：针对当前的一些具有置乱-扩散结构的图像加密算法中,存在加密程度低的问题,提出了一种新的图像加密算法.置乱阶段先利用格雷码变换进行全局的置乱,然后再根据混沌序列进行行列间置乱变换.扩散部分采用了正向和反向的异或操作.实验结果表明,该算法提高了密文的安全性和密钥的敏感性,增大了密钥空间的大小,同时能很好的抵抗统计分析、穷举攻击等.Aiming at solving the problem that some image encryption algorithms with the permutation-diffusion structure have low degree of encryption,this paper presents a new image encryption method.In the scrambling stage,firstly global scrambling uses gray code transformation,then scrambles pixel among row and column by chaos sequence.Diffusion part adopts the forward and reverse exclusive OR operation.The experimental results show that the proposed algorithm enhances the security of the cipher-image,key sensitivity,and increases the size of the key space,at the same time it can resist the statistical analysis,brute force attack.

关 键 词：图像加密 格雷码 混沌系统 SHA-384 安全性分析 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构] TP391.41[自动化与计算机技术—计算机科学与技术]