分段线性混沌图最高有效位大容量图像加密算法  

Most Significant Bit of Piecewise Linear Chaotic Map for Large Capacity Image Encryption Algorithm

作　　者：方颂 王彦娴[2] 谭阳[2] FANG Song;WANG Yanxian;TAN Yang(School of Computer and Science,Hunan University,Changsha 410000,China;;Hunan Radio and TV University,Changsha 410004,China)

机构地区：[1]湖南大学计算机科学学院,长沙410000 [2]湖南广播电视大学,长沙410004

出　　处：《计算机工程》2018年第11期251-256,264,共7页Computer Engineering

基　　金：湖南省自然科学基金(2018JJ2104,2018JJ2014);湖南广播电视大学校级课题“专业课程数字化资源开发与共享研究”(XDK2017-A-3)。

摘　　要：针对图像加密在信息封装过程中存在容量小的问题,提出一种基于最高有效位(MSB)的大容量可逆数据加密方法。通过构建分段线性混沌图加密方式,进行数据封装和可逆数据重建。给出一种预测误差修正方法,构建加密数据误差的二进制图实现对加密过程的修复,以提高加密数据的重建质量。选取眼睛、身体和脑部3幅CT图像进行仿真,结果表明,该算法在水平和垂直相关系数等6项指标上优于块混淆和多级扩散的图像加密算法。Aiming at the problem that image encryption has small capacity in information encapsulation process,a large-capacity reversible data encryption method based on the Most Significant Bit(MSB)is proposed.Data encapsulation and reversible data reconstruction are realized by constructing a piecewise linear chaotic map encryption method.A prediction error correction method is proposed.By using the binary graph of the error of the encrypted data,the encryption process is repaired and the reconstruction quality of the encrypted data is improved.The simulation results on selected CT images of eyes,body and brain show that the proposed algorithm is superior to the block-based confusion and multiple levels of diffusion algorithm in six indicators,such as horizontal and vertical correlation coefficients.

关 键 词：分段线性 混沌图 最高有效位 可逆 大容量 数据加密 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]