一种基于新型混沌的彩色图像加密算法  

A color image encryption algorithm based on novel chaos

作　　者：薛伟[1] 王磊[1] XUE Wei;WANG Lei(College of Internet of Things Engineering, Jiangnan University, Wuxi 214000, China)

机构地区：[1]江南大学物联网工程学院

出　　处：《光学技术》2018年第3期263-268,共6页Optical Technique

基　　金：国家自然科学基金资助项目(61374047)

摘　　要：针对彩色图像加密运算量大、空间需求较大和安全性低的问题,提出一种基于新型混沌的彩色图像加密算法。将彩色图像的三维矩阵转换为二维矩阵后对明文图像进行小波变换,低频小波系数矩阵进行重叠分块,然后进行矩阵块置乱操作和小波反变换,实现图像的初次加密;利用Lorenz和tent混沌系统,根据动态参数控制混沌系统模型构造新的混沌系统,新的混沌系统生成伪随机数对初次加密后图像进行扩散操作,最终得到加密图像。仿真实验证明,图像经加密后能很好地隐藏原有信息,能抵抗统计、差分等攻击。Aiming at the problems of large amount of computation,large space requirement and low security in color image encryption,a novel color image encryption algorithm based on novel chaos is proposed. Firstly,The three-dimensional matrix of the color image is transformed into a two-dimensional matrix and performing wavelet transform on the plain image. Then the lowfrequency wavelet coefficient matrix is divided into overlapping blocks. Next,matrix blocks scrambling and wavelet inverse transform are performed to achieve initial encryption. A new chaotic system is constructed by using Lorenz and tent chaotic system based on the dynamic parameter control system. Then the pseudo-random number generated by the new chaotic system is used to perform the pixel value diffusion operation on the primary encrypted image. Finally the encrypted image is got. The simulation experiment shows that plaintext image encrypted by the algorithm can be very good to hide the original information and resist attacks such as statistics and differentials.

关 键 词：混沌 小波变换 重叠分块 LORENZ TENT 置乱 扩散 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]