机构地区: 汕头大学理学院
出 处: 《汕头大学学报(自然科学版)》 2016年第3期16-24,68,共10页
摘 要: 本文提出了一种基于混沌和置换-替代机制的图像加密方法.该加密算法只对图像作一轮置换和一轮替代就达到非常好的加密效果.加密算法采用广义Arnold映射生成置换和替代时需要的一系列向量,并且采用整行和整列加密取代传统加密算法中的逐个像素加密,从而提高了加密的效率.本文还分析了加密算法的安全性,包括直方图分析,密钥敏感性分析,相邻像素相关性分析,信息熵分析,差分攻击分析等.所有的实验数据都表明本文所提的加密算法能有效的抵抗各种攻击,是一种简单有效的加密算法,在图像安全方面有一定的应用价值. An image encryption scheme based on chaos and permutation-substitution mechanism is proposed. One round of permutation-substitution process achieves desirable security results. The generalized Arnold map is applied to generate the pseudo-random sequences for the permutation and substitution processes, which are implemented row-by-row/column-by-column instead of pixel-by-pixel to increase the encryption rate. The security and performance analysis of the proposed image encryption scheme are carried out using the histograms, correlation coefficients, information entropy, differential analysis, etc. All the experimental results show that the proposed image encryption scheme is highly secure and owns excellent performance.
领 域: [自动化与计算机技术] [自动化与计算机技术]