基于位平面的自适应参数图像加密算法  

Image encryption algorithm of adaptive parameter based on bit-plane

作　　者：林振荣[1] 倪骍波 谌志涛 

机构地区：[1]南昌大学信息工程学院,江西南昌330031

出　　处：《计算机工程与设计》2016年第3期597-601,642,共6页Computer Engineering and Design

基　　金：江西省教育厅科技基金项目(GJJ12048);江西省科技计划基金项目(20122BBE500049)

摘　　要：针对图像传输安全问题,提出一种基于位平面自适应参数与分块的图像像素置乱与扩散加密方法。置乱阶段基于位平面分解,根据各位平面所含原始图像信息量不同分为5组,确定相应的自适应参数,更改初始迭代值,每组置换方式采用行列循环交换置乱。由于初始迭代值与明文密切相关,合并位平面后采用图像自适应分块像素值扩散。考虑到一维混沌系统安全性低,高维混沌系统复杂,这两个阶段混沌序列由两个不同二维混沌系统产生。实验结果表明,该算法密钥空间及敏感度高,能够抵御统计攻击,抗差分攻击效果良好。In view of the image transmission security issues,an image pixels scrambling and diffusion encryption algorithm of adaptive initialization parameters and block was proposed.In the scrambling stage,based on bit-plane decomposition,the image was divided into five groups according to the original image information that each bit-plane contained and the corresponding adaptive parameter was determined to update the initial-key.Each group used the row and column circulation exchange for scrambling.Due to the initial-key closely related to the plaintext,diffusing pixel values with adaptive image block was used in the diffusion stage after merging the bit-planes.Considering the poor security of the one-dimensional chaotic systems and the complexity of the high dimensional chaotic systems,the chaotic sequences of the two phases were generated through two different two-dimensional chaotic systems.Experimental results show that the algorithm has large key space and high key sensitivity.It can resist statistical attack and has good effect on resisting differential attack.

关 键 词：图像加密 位平面 自适应 置乱 扩散 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]