摘要
针对目前混沌系统加密算法中明文相关性差和信息熵低的问题,提出一种基于循环移位和混沌系统的灰度图像加密算法.根据明文图像的统计特征,计算需要循环移位的位数;对灰度图像每一个灰度值进行左循环移位得到移位图像;根据初始条件和参数迭代生成3个不同的Logistic混沌序列;根据生成的混沌序列对移位图像进行加密生成加密图像.基于此,对图像直方图、密钥空间、相关性及信息熵进行测试和分析.理论分析及仿真结果表明该算法加密效率高,抗攻击能力较强,安全性好.
Aiming at the problem of image encryption algorithms based on chaotic system, less relevance to the plain image and low information entropy, a new image encryption algorithm based on cyclic shift and chaotic system was proposed. Firstly, the cyclic shift number was generated by statistical characteristics of plain image. Secondly, cyclic shift image was attained by left cyclic shift of each gray value of the gray image. Thirdly, three different logistic chaotic sequences were generated by iteration according to initial conditions and parameters. Finally, cyclic shift image was encrypted according to the generated chaotic sequence, and the encrypted image was obtained. Tests and analyses of image histogram, and key space, and correlation and information entropy were carried out. Theoretical analysis and simulation results showed that this algorithm had high encryption efficiency, a desirable ability to resist different kinds of attacks and good security.
作者
谢毅
彭静静
左宪禹
葛强
范明虎
田军锋
XIE Yi;PENG Jingjing;ZUO Xianyu;GE Qiang;FAN Minghu;TIAN Junfeng(Henan University,Key Laboratory of Geospatial Technology for Middle and Lower Yellow River Regions,Ministry of Education,Henan Kaifeng475004,China;Henan University,College of Computer and Information Engineering,Henan Kaifeng475004,China;Henan University,Key Laboratory of Big Data Analysis and Processing of Henan Province,Henan Kaifeng475004,China;Henan University,Institute of Data and Knowledge Engineering,Henan Kaifeng475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2020年第2期221-227,共7页
Journal of Henan University:Natural Science
基金
国家重点研发计划课题基金资助项目(2017YFD0301105)
国家自然科学基金资助项目(U1604145,U1704122)
河南省科技厅计划项目(182102210242,182102110065,192102210096).
作者简介
谢毅(1983-),男,河南郏县人,讲师,博士研究生.研究方向:空间优化,遥感图像处理,图像加密;通信作者:田军锋,E-mail:tjf328@126.com
