混沌系统和移位寄存器相融合的图像安全分析算法  

Image Security Analysis Algorithm Based on Fusion of Chaotic System and Shift Register

作　　者：杨杰[1] 尹向东[1] 刘小兵[1] 

机构地区：[1]湖南科技学院电子与信息工程学院,湖南永州425199

出　　处：《吉林大学学报（理学版）》2017年第3期657-663,共7页Journal of Jilin University:Science Edition

基　　金：湖南省科技计划项目(批准号:2014FJ6095);永州市科技局科技创新项目(批准号:201627);湖南科技学院计算机应用技术重点学科项目

摘　　要：为了提高图像的安全性,针对传统图像分析算法存在抵抗攻击能力弱、密钥空间小等缺陷,提出一种混沌系统和移位寄存器相融合的图像安全分析算法.首先对图像安全进行分析,找到单移位寄存器和混沌系统存在的局限性;然后采用移位寄存器产生的序列确定混沌系统的初始值,通过不断迭代产生新的伪随机序列,并采用伪随机序列作为密钥流对图像进行加密操作;最后通过图像加密效果进行仿真验证和安全性分析.结果表明,该算法提高了图像加密系统的工作效率,可抵抗各种攻击,获得了较理想的图像加密效果,可以保证图像在网络上的安全传输.In order to improve the security of image, aiming at the defects of traditional image analysis algorithm, such as weak ability resistance attacks and small key space, we proposed an image security analysis algorithm based on the fusion of chaotic system and shift register. Firstly, we analyzed security of image to find the limitations of single shift register and chaotic system. Secondly, initial value of chaotic system was determined by sequence generated by shift register, and a new pseudo- random sequece was generated by continuous iteration, and using pseudo-random sequence as key stream to encrypt image. Finally, we simulated image encryption effect and security analysis. The results show that proposed algorithm improves work efficiency of the image encryption system, can resist a variety of attacks, and obtains the ideal image encryption effect and can ensure the security of image transmission on the network.

关 键 词：图像安全 加密算法 混沌时间序列 像素自相关 移位寄存器 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]