基于提升小波变换的超混沌图像加密方案  

An Hyperchaotic Image Encryption Scheme Based on Lifting Wavelet Transformation

作　　者：张欢[1] 蔡如华[1] 

机构地区：[1]桂林电子科技大学数学与计算科学学院,广西桂林541004

出　　处：《微电子学与计算机》2011年第7期46-49,53,共5页Microelectronics & Computer

基　　金：广西区教育厅基金项目(200607LX010);广西区科学基金项目(0731018)

摘　　要：研究了一种基于提升小波变换与二维超混沌系统的图像加密方案.首先将图像进行整数提升小波变换,根据自适应排列置乱算法对提升小波变换后的低频子带系数进行调整置乱.然后由两个二维超混沌系统生成混沌序列并进行预处理,同时构造双混合反馈系统.最后利用双混合反馈系统对小波重构后的图像进行像素灰度值替代加密.仿真结果表明,该加密方案弥补了图像经传统小波变换后不能无失真重构的缺陷,并克服了单一的低维混沌系统保密性不高的缺点,在密钥空间和抵抗各种攻击方法上均有较好的改进,具有较高的安全性和实用性.This paper proposes an image encryption scheme based on interger lifting wavelet transformation and 2D hyperchaotic system.Firstly,the low-frequency coefficients of the image integer lifting wavelet transformation are adjusted by self-adaptive permutation algorithm.Secondly,making use of the pretreated chaotic sequences which were generated by two 2D hyperchaotic systems,we construct dual hybrid feedback.Finally,the image after the wavelet reconstruction is encrypted by dual hybrid feedback systems.The experimental results demonstrate that the encryption scheme make up this deficiency which the image after the traditional wavelet reconstruction is distortion,and overcome this deficiency which the confidentiality of single low-dimensional chaotic system is not high,which has better improvement on both the key space and the resistance of various attacks than the other schemes and possesses high security and practicability.

关 键 词：超混沌系统 提升小波变换 图像加密 自适应 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]