基于小波变换域混沌加密与循环移位的改进图像加密算法  

Chaotic encryption in wavelet transform and cycle shift based improved image encryption algorithm

作　　者：包林霞[1] 刘伟[2] Bao Linxia;Liu Wei(Dept,of Information Engineering,Changzhou Vocational of Mechatronic Technology,Changzhou Jiangsu 213164,China;School of Computer Science & Technology,Nanjing University of Science & Technology,Nanjing 210094,China)

机构地区：[1]常州机电职业技术学院信息工程系,江苏常州213164 [2]南京理工大学计算机科学与技术学院,南京210094

出　　处：《计算机应用研究》2016年第10期3074-3077,3108,共5页Application Research of Computers

基　　金：国家自然科学基金资助项目(61273251);江苏省自然科学基金资助项目(BK2010548)

摘　　要：传统混沌图像加密算法均对图像的空间域进行处理,该情况的密钥敏感度较低、关联性较高,对此,提出一种基于小波变换域混沌加密与循环移位的改进图像加密算法。首先,根据原图像生成对应的密钥,并采用该密钥对原图像作循环移位处理;然后,将图像进行小波变换,获得小波变换域;最后,对图像进行二维混沌映射,作置乱处理。实验结果表明,本算法的统计性能、鲁棒性能以及密钥敏感性均具有一定的优势。Traditional chaotic image en cryption a lgo rithm is based on the spatial domain of the image, leading to a low keyse nsitivity and difference perform ance, this paper proposed a chaotic encryption in w avelet transform and cycle sh ift based im provedimage en cryption algo rithm to overcome th a t problem . Firstly , it generated different keys according to the o rig in im a ges, it transform ed the image pixels were cycle shifted with the keys ; then it transform ed the image into wavelet domain ; lastly, it perform ed 2 D chaotic map to the im age, and substituted and diffu sed the o rig in code. E xperim ents results show th a t, theproposed a lgo rithm has a good perform ance in statistica l pe rform ance, robustness, key sen sitivity perform ance.

关 键 词：小波变换 混沌算法 图像加密 循环移位 鲁棒性 密钥敏感性 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]