基于整数红-黑小波变换的图像加密算法  

Algorithm of Image Encryption Based on Integer Red-Black Wavelet Transform

作　　者：闫兵[1,2] 柏森[1,2] 朱桂斌[1,2] 季晓勇[1,2] 

机构地区：[1]重庆通信学院信息工程系,重庆400035 [2]应急通信重庆市重点实验室,重庆400035

出　　处：《重庆理工大学学报（自然科学）》2016年第12期122-128,共7页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(61272043);重庆市基础与前沿研究计划项目(cstc2013jjB40009);重庆市科技研发基地能力提升项目(cstc2014pt-sy40003);重庆市研究生科研创新项目(cys14239)资助

摘　　要：设计了一种基于整数红-黑小波变换的图像加密算法。首先对图像进行最大层数整数红-黑小波变换,然后仅加密非零高频系数,加密方法是利用交叉混沌映射生成的混沌序列对系数进行扩散。最后,对加密后的系数矩阵进行类似zigzag扫描,得到加密数据并传输到接收方。该方案弥补了传统频域加密算法不能无损重构的缺陷,克服了单一、低维混沌系统保密性不高的缺点,密钥空间大、敏感性强,并且能有效抵抗信息丢失,具有很好的安全性和实用性。An algorithm of image encryption based on integer red-black wavelet transform is presented in this paper. The original image was transformed by integer red-black wavelet with the highest decomposition level firstly,and then the nonzero high-frequency coefficients were diffused by chaotic sequence generated by cross chaotic map. The elements of encrypted coefficients matrix were reordered by similar zigzag scan coding lastly, which would be transmitted to receiver. Thecryptosystem makes up flaws which the reconstructed image after the traditional wavelet encryption is distortion,and overcomes the deficiency that the confidentiality of single low-dimensional chaotic system is not high. The scheme has a high sensitive key with large space,it can resist the loss of information,and possesses high security and practicability.

关 键 词：整数红-黑小波变换 部分加密 交叉混沌映射 无损重构 图像加密 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]