一类选择性图像加密方案的安全性分析  

Security Analysis of a Class of Selective Image Encryption Scheme

作　　者：朱志良[1] 张志强[1] 高健[1] 于海[1] 

机构地区：[1]东北大学软件学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2010年第3期342-345,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(60872040);辽宁省自然科学基金资助项目(20082037);辽宁省高等学校优秀人才支持计划项目

摘　　要：对一类选择性加密方案的安全性进行了分析,并根据图像相邻像素相关性的性质,利用密文中泄露的信息和已知明文攻击方法,给出了针对此类加密方案的攻击方案.通过实验验证了攻击方案的有效性.实验结果表明,对于相邻像素相关度较高的图像,利用密文中未加密的信息可以用较少的明文恢复出较多的明文信息,说明了此类选择性加密方案对于相邻像素相关度较高的图像是不安全的.最后,针对已知明文攻击,对选择性加密方案提出了改进意见.The security of a class of selective encryption scheme was analyzed.According to the characteristics of the correlation of adjacent image pixels,an algorithm to attack the encryption scheme was given using the disclosed information from cipher text and the method of known-plaintext attack,and the validity of the algorithm was verified by experiments.The experimental results showed that the higher the correlation of adjacent pixels of an image,the less the plaintext available to recover more information in plaintext by use of not encrypted information in cipher text.Therefore,for an image which has a high correlation between adjacent pixels,the selective encryption scheme is unsecured.The selective encryption scheme is thus correspondingly.

关 键 词：选择性加密 已知明文攻击 相邻像素相关性 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]