基于位运算的动态多混沌图像加密算法  

Dynamic Multi-chaos Image Encryption Algorithm Based on Bit Operation

作　　者：杨晓刚[1] 王飞[2] 毛彦斌 薛永才 

机构地区：[1]西安交通大学 [2]西安电子工程研究所 [3]解放军69220部队

出　　处：《火控雷达技术》2015年第2期22-27,36,共7页Fire Control Radar Technology

摘　　要：针对现有的图像加密算法存在运算成本大,算法复杂等问题,提出了一种基于位运算的动态多混沌图像加密算法。该算法运用Logistic和Chebyshev两种不同的混沌映射,对原始图像像素进行位置置乱和灰度值替换。在灰度值替换过程中,加入了位运算和动态选择行向量环节,使加密算法在安全性上更加可靠。实验表明:文中提出的图像加密算法,既可以很好地提高加解密的速度,又可以保证成功抵御统计分析等各种攻击操作,具有很强的鲁棒性和抗枚举攻击的能力。对一幅标准的256×256的Lena图像来说,加密时间约为5s,解密时间约为5.2s,能够满足现实需求。A dynamic multi-chaos image encryption algorithm based on bit operation is presented aiming at issues like large operation cost and complex algorithm existed in available image encryption algorithm. The algorithm uses two different chaotic maps like Logistic and Chebyshev to scramble the positions and replace the gray values for the original image pixels. In the process of grey value replacement, adding bit operation and dynamically choosing row vector link can make safety of encryption algorithm more reliable. Experiments show that using the proposed image encryption algorithm can improve the speed of encryption not only, but also guarantee success against various attac-king operations like statistical analysis, which has strong robustness and enumeration attack resistance. For a stand-ard 256 × 256 Lena image, encryption time is about 5s, decryption time is about 5. 2s, which can meet the demand of reality.

关 键 词：位运算 动态多混沌 图像加密 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]