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基于混沌序列的位图像加密研究
引用本文:高飞,李兴华.基于混沌序列的位图像加密研究[J].北京理工大学学报,2005,25(5):447-450.
作者姓名:高飞  李兴华
作者单位:北京理工大学,信息科学技术学院电子工程系,北京,100081
摘    要:针对低维混沌序列加密数字图像保密性较差的问题,提出了一种复合混沌序列和基于混沌序列的位图像加密算法.通过Logistic映射的动力学分析,对混沌序列生成方法进行3点改进,将改进后序列和Henon序列作为子序列生成复合混沌序列.由于复合序列掩盖了混沌子序列的分布特性,因此增强了序列的保密性.加密算法综合应用置乱、置换两种加密技术在空域和小波域做两次加密,理论分析和试验结果表明,加密图像不仅完全依赖于密钥,而且可以抵制常用攻击算法.

关 键 词:混沌序列  图像加密  离散小波变换  位平面  混沌序列  图像加密  研究  Chaotic  Sequences  Based  Study  Encryption  攻击算法  密钥  完全  结果  试验  分析  理论  小波域  空域  加密技术  应用  综合  加密算法
文章编号:1001-0645(2005)05-0447-04
收稿时间:2004/8/23 0:00:00
修稿时间:2004年8月23日

Bitmap Encryption Study Based on Chaotic Sequences
GAO Fei and LI Xing-hua.Bitmap Encryption Study Based on Chaotic Sequences[J].Journal of Beijing Institute of Technology(Natural Science Edition),2005,25(5):447-450.
Authors:GAO Fei and LI Xing-hua
Institution:Department of Electronic Engineering,School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China;Department of Electronic Engineering,School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Abstract:The secrecy of encryption image usually decreases when using low dimension chaotic sequences. A bitmap encryption algorithm was proposed based on the chaotic sequence, and a composite sequence was introduced. Through analyzing the dynamics of Logistic maping chaos system, three propositions were presented to improve the method for producing chaotic sequence. A composite sequence is composed of this chaotic sequence and Henon sequence, its security is enchanced because the distribution functions of chaotic subsequences are concealed by the composite sequence. Encryption was implemented twice when using two different techniques of image scrambling transformation and substitution in the space and DWT domain. Experimental results and theoretical analysis show that cipher image completely depends on secret key, and can resist the attack of common attack algorithms.
Keywords:chaos sequence  image encryption  discrete wavelet transform(DWT)  bit plane
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