改进的加密算法在医学图像上的应用  

Application of extended encryption algorithm in medical image

作　　者：陈珂[1] 崔志明[1,2] 

机构地区：[1]苏州市职业大学,江苏苏州215004 [2]苏州大学智能信息处理及应用研究所,江苏苏州215006

出　　处：《计算机工程与设计》2009年第3期752-754,758,共4页Computer Engineering and Design

基　　金：江苏高校科研成果产业推进工程基金项目(JHB06-26);苏州职业大学2007年度科研基金项目(SZD07L28)

摘　　要：采用二维离散混沌模型,研究了从混沌序列到加密因子序列的映射方法。基于Rijndael算法的设计原理,并且结合加密因子序列的优良伪随机特性,提出一种基于Rijndael的改进加密算法。改进了Rijndael中的行置换、列置换和密钥编排方案,使之成为替代与置换相结合的图像加密算法。实验结果表明,加密后的图像类似于白噪声的图像,达到了较为理想的置乱效果,特别是在不考虑噪声等外界影响前提下该算法可以实现无损加密,具有很好的应用前景,能很好地适用于要求高保密性的医学图像文件。Mapping method about chaotic sequence is researched to encryption factor sequence using two-dimensional discrete chaotic model. Based on the design principle of Rijndael, and combined with the excellent sequence pseudo-random characteristics of Sequence encryption factor, a extended encryption algorithm is proposed. The Rijndael＇ s ShiftRows, MixColumns and key schedule are improved and realizes that image encryption algorithm which scrambling the positions and substitute for the image pixel are combined. The experimental result shows that the encrypted image is similarly the white noise, to gain the good scrambling degree. Especially when ignoring the outer noise the algorithm realize the lossless encryption. It has good application prospect and is applicable to medical image of requesting the high confidentiality.

关 键 词：二维离散混沌 加密因子序列 RIJNDAEL算法 密钥编排 图像加密 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]