基于标准混沌映射的图像加密/解密算法  

Image encryption/decryption algorithm based on standard chaos map

作　　者：樊春霞[1] 姜长生[1] 

机构地区：[1]南京航空航天大学自动化工程学院,江苏南京210016

出　　处：《哈尔滨工业大学学报》2006年第1期119-122,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(6017404590405011)

摘　　要：利用离散混沌系统易于生成、对初值敏感以及具有白噪声的特点,设计了一种图像加密/解密算法.利用标准映射实现了类似于密码学中的Fe istel网络结构,对图像进行了置换操作;利用Logistic混沌动力系统设计密钥,实现了图像灰度值的替代和扩散.结果表明,该算法具有足够大的密钥空间,可以实现一次一密,具有良好的统计特性;算法易于实现,具有较高的效率.A new image encryption/decryption algorithm is designed via a discrete chaos map because a discrete map is easily created, sensitive to initial value and processes the characteristics of white noise. Permutation of an image is realized by a network which is similar to a “Feistel network” - - a standard map. Substitution and diffusion of grey are carried out by designing secrete keys using Logistic chaos dynamics. The analysis results show that large enough secrets keys of algorithm is benefit to once key once encryption, perfect statistical characteristics make it defend the attack of knowing cryptography and sensitivity to plaintext make it defend the difference attack. The proposed algorithm is easily realized and encryption efficiency is high.

关 键 词：离散混沌动力系统 图像加密 标准映射 FEISTEL网络 解密 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]