基于Arnold cat映射与ECC的图像加密方法  

Image encryption based on arnold cat map and ECC

作　　者：刘伊凡[1] 余艳梅[1] 罗代升[1] 

机构地区：[1]四川大学电子信息学院,成都610065

出　　处：《四川大学学报（自然科学版）》2012年第4期834-838,共5页Journal of Sichuan University(Natural Science Edition)

摘　　要：提出了一种基于Arnold cat映射以及椭圆曲线密码体制的图像加密算法.首先对图像用Arnold cat变换进行置乱,用Logistic混沌系统产生的整数序列替换Arnold cat变换的参数空间,从而抵制图像置乱部分的周期迭代攻击.再对图像像素依次用椭圆曲线加密体制进行加密,将置乱图像划分为大小相同的图像块,为每一图像块分配相同的密钥,在保证了安全性能的同时也大大提高了算法效率.理论分析和实验结果表明,该算法安全性能高,加密效果理想,是一种可靠的加密方法.On the basis of Arnold cat map and ECC, an image encryption algorithm is proposed. The pa- rameter space of Arnold cat transformation is replaced with the integers sequence produced by logistic chaotic system, and thus the cycle iterative attacks to the part of image scrambling can be resisted. ECC is used to encrypt the pixels in turn. By deviding the image into blocks with the same size and allocating the same key for each imge block, the security is certified and the efficiency of the algorithm is signifi- cantly improved. Theoretical analysis and experimental results show that the algorithm is a reliable en- cryption method of high security and ideal encryption effect.

关 键 词：图像加密 Arnoldcat映射 混沌加密 椭圆曲线密码体制 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]