改进的基于位平面的图像加密算法  

Improved image encryption algorithm based on bit-plane

作　　者：徐超[1] 张雪锋[1] 

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710061

出　　处：《计算机工程与设计》2014年第2期451-456,共6页Computer Engineering and Design

基　　金：陕西省教育厅专项科研计划基金项目(12JK0498;12JK1008);西安邮电大学青年基金项目(ZL2011-03;ZL2012-03)

摘　　要：在对已有图像加密算法进行分析的基础上,给出一种改进的基于位平面的图像加密算法。对原始图像采用基于位平面的排序处理,在此基础上,给出一种作用于各位平面的置乱处理方法。置乱过程不仅使用了传统置乱处理中的扩散方式,而且将各位平面划分出的若干块在扩散的同时各自按照独立的排序方法进行置乱,其中具体的排序方法采用混沌序列来控制。仿真结果表明,该方法具有较好的密钥空间及敏感性,同时具有较好的抗剪切攻击能力。On the basis of the analysis of the existing image encryption algorithm, an improved image encryption algorithm based on bit-plane is proposed. After using the bit-level permutation scheme on the original image, a scrambling algorithm on each bit plane is proposed, the improvement of this algorithm is not only using diffusion in the scrambling process, but also giving the each point on the bit plane ranking method respectively after diffusion, meanwhile, the right of choosing ranking method is given to chaotic sequence. Results of various types of analysis prove that this method has a large key space and good key sensitivity, and it has ability to resist the shear attack.

关 键 词：图像加密 混沌 置乱 位平面 分块排序 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]