方波曲线耦合零交叉边缘检测的图像加密算法  

Image encryption algorithm based on square curve and zero-crossing edge detection

作　　者：朱珍[1] 卢世军 张福泉[3] ZHU Zhen;LU Shi-jun;ZHANG Fu-quan(School of Information Engineering,Guangdong Engineering Vocational College,Guangzhou 510520,China;School of Geography and Planning,Sun Yat-Sen University,Guangzhou 510275,China;School of Software,Beijing University of Technology,Beijing 100081,China)

机构地区：[1]广东工程职业技术学院信息工程学院,广东广州510520 [2]中山大学地理科学与规划学院,广东广州510275 [3]北京理工大学软件学院,北京100081

出　　处：《计算机工程与设计》2018年第10期3055-3062,3175,共9页Computer Engineering and Design

基　　金：国家自然科学基金项目(61273072);国家教育部博士点基金项目(20121101110037)

摘　　要：为解决当前图像加密算法主要是利用相同的加密操作对所有像素实现置乱与扩散,导致密文的安全性不高的问题,提出基于方波空间填充曲线与零交叉边缘检测的选择性图像加密算法。利用正交多项式变换OPT(orthogonal polynomials transform)处理每个明文子块,获取其对应的OPT系数,计算子块的梯度值;基于零交叉边缘检测机制,判断子块的重要性,将其划分为感兴趣区域与不重要区域;设计方波空间填充机制,置乱这些区域的子块;构建异扩散函数,完成对不同区域置乱子块的加密。实验结果表明,与当前图像加密技术相比,所提算法具有更高的安全性与抗明文攻击能力。To solve the defects of low security of cipher induced by using the same encryption operation to realize the scrambling and diffusion of all pixels in current image encryption algorithm,a selective image encryption algorithm based on square space filling confusion and zero-crossing edge detection was designed.Each sub-block of plaintext was processed based on orthogonal polynomial transform to get the OPT coefficients corresponding to each block for calculating the gradient values of each sub block.The plaintext was divided into regions of interest and non-significant regions based on the zero crossing edge detection mechanism.A square-wave space filled mechanism was designed to scramble the sub-block in these regions.The difference diffusion function was constructed to independently encrypt permutation sub-blocks of different regions.Experimental results show that the proposed algorithm has higher security and anti-plaintext attack ability compared with the current image encryption technology.

关 键 词：选择性图像加密 正交多项式变换 零交叉边缘检测 方波空间填充 引擎参数 异扩散函数 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]