一种动态猫映射混沌图像加密算法
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摘要:
针对传统猫映射存在周期性以及位置(0,0)处像素始终固定导致的安全隐患,提出了一种基于动态猫映射的图像加密算法.首先把密钥经过md5变换后得到一个十六进制字符串,利用该字符串,获取动态猫映射的分块边界参数,并通过md5的随机性构建扩散阶段需要的S盒.在置乱阶段,将猫映射置乱参数与明文图像结合起来,进行动态猫映射,得到置乱图像.在扩散阶段,每个像素值用S盒进行扩散时,结合相邻像素值,形成雪崩效应.最后进行仿真实验,结果表明提出的加密算法能满足图像加密的安全性需求,不仅改善了传统猫映射存在的缺陷,而且具有更好的加密效果.
As the problem that traditional cat mapping is periodic and the position（0,0）is always fixed perplexes the security of information,an image encryption algorithm based on dynamic cat mapping is proposed.Firstly,the key is transformed by md5 to generate a hexadecimal string.This string is used to take the block boundary of the dynastic cat mapping.Meanwhile,the S-box which is needed in the diffusion phase is generated via the hexadecimal string.In the process of scrambling,the plain image is encrypted with scramble parameters by dynamic cat map.Then,the scrambling image is obtained.In the process of diffusion,the S-box is used with conjunction with the adjacent pixel value when the current pixel is processed so that the change of each pixel can cause the others＇ variation to form the avalanche effect.Finally,the simulate results show that the proposed encryption scheme satisfies the security requirements of image encryption,which not only avoids the disadvantage of periodicity in property,but also has a better performance than traditional cat mapping.
作者:
王鲜芳 王晓雷 王俊美 李名
Wang Xianfang;Wang Xiaolei;Wang Junmei;Li Ming(College of Computer and Information Engineering;Engineering Technology Research Center for Computing Intelligence ＆ Data Mining of Henan Province,Henan Normal University,Xinxiang 453007,China)
机构地区:
betway官方app 计算机与信息工程学院 betway官方app 计算智能与数据挖掘河南省高校工程技术研究中心
出处:
《betway官方app 学报：自然科学版》 CAS 北大核心 2018年第5期110-117,共8页
基金:
国家自然科学基金(61173071 61602158) 河南省高校创新人才支持计划项目(2012HASTIT011) 中国博士后科学基金资助项目(2016M600030)
关键词:
动态猫映射 混沌 图像加密 S盒
dynamic cat mapping chaotic image encryption S -box
分类号:
TP309.7 [自动化与计算机技术—计算机系统结构]
