用混沌映射的图像加密算法实现FPGA  

An field programmable gate array implementation of an image encryption algorithm based on a discrete chaotic map

作　　者：廖晓峰[1] 岳蓓[1] 周庆[1] 南海[1] 

机构地区：[1]重庆大学计算机学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2008年第10期1189-1193,共5页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(60573047);重庆市自然科学基金资助项目(8509);重庆大学研究生创新基金资助项目(200609Y1B0150174)

摘　　要：为了解决数据信息量大的多媒体加密系统软件不能满足实时性要求这一问题,提出了一种适宜于硬件加密的基于Kolmogorov混沌映射的图像加密算法——MASK(mix add Sbox kol-mogorov),并将整个算法在Cyclone EP1C6 FPGA(field programmable gate array)上实现。该算法由4个基本变换组成,M变换、A变换、S盒变换和K映射变换,分别具有扩散、加密钥、非线性和置乱的效果。随后就整个算法安全性在相邻象素的相关性、UACI和密钥空间等方面进行了讨论,并统计得到算法的硬件实现的资源占用率较低。实验结果说明该系统具有安全性高、加密速度快、硬件资源消耗小等优点,适用于低端FPGA硬件的开发。Software encryption cannot satisfy real-time requirements for multimedia applications which usually involve large volumes of data. To address this problem, an field programmable gate array（FPGA） implementation of the Cyclone EP1C6 for a Kolmogorov chaotic map-based image encryption algorithm MASK was proposed. The algorithm was composed of four basic parts： Mixture, key Add, S-box and Kolmogorov chaotic map transforms. These parts specifically act on the image as follows： diffusion, applying secret keys, nonlinearity, and permutation. The correlation of adjacent pixels, UACI and the key space of the system subsequently were studied. The source occupation proportion of the hardware was calculated statistically and showed low occupation. Among the advantages of the proposed system are high security, fast encryption speed, and low hardware resources consumption. The proposed system is suitable for implementation in inexpensive FPGA.

关 键 词：密码学 混沌理论 图像处理 FPGA 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]