一种基于五维超混沌系统的数字图像加密算法

A Digital Image Encryption Algorithm Based on Five-Dimensional Hyperchaotic System

构造新的混沌系统和超混沌系统是数字图像加密中重要的组成部分.首先构建了一个5维超混沌系统;其次对其做了一些简要的动力特征分析;最后,把其产生的混沌序列与图像的像素值进行了按位“异或”运算,得到了加密图像.实验结果和理论分析表明,该算法具有密钥空间大、密钥敏感性高的特性,能够有效地抵御统计分析和灰度值分析的攻击,对数字图像的加密具有良好的加密效果.

Constructing new chaotic systems and hyperchaotic systems is an important part of digital image encryption.First,this paper constructs a 5-dimensional hyperchaotic system.Secondly,it made some brief dynamic characteristics analysis.Finally,the chaotic sequence generated by it and the pixel value of the image are subjected to a bitwise XOR operation to obtain an encrypted image.The experimental results and theoretical analysis show that the algorithm has a large key space and high key sensitivity.It can effectively resist attacks using statistical analysis and gray value analysis,and has good encryption effects on digital images.