基于混合混沌与位分解的图像置乱改进算法  

Image scrambling optimization algorithm based on mixed chaos system and bit decomposition

作　　者：陆萍[1] 董虎胜[1] 马小虎[2] 

机构地区：[1]苏州经贸职业技术学院信息系,江苏苏州215009 [2]苏州大学计算机科学与技术学院,江苏苏州215021

出　　处：《计算机工程与应用》2011年第21期191-194,共4页Computer Engineering and Applications

基　　金：江苏省自然科学基金(No.BK2007050)

摘　　要：针对当前基于混沌系统的图像置乱算法中所存在的"平凡密钥"现象,对一种基于Logistic混沌序列与位交换的图像置乱算法进行了分析,给出了改进算法。算法采用Logistic与Chebyshev混合混沌映射交替迭代生成混沌序列,在完成像素点重新散布后,根据其位置信息截取混沌二值序列实现对像素灰度值的加密。仿真实验结果表明,该算法具有良好的图像置乱效果及更好的安全性。For the existence of invalid-keys in current image scrambling algorithms based on chaos system,an extended algorithm is presented after the analysis of an image encryption algorithm based on chaotic sequence and bit exchange.Chaotic sequence is generated by mixed chaotic maps of Logistic and Chebyshev in the algorithm.Pixels of image are redistributed,and the gray values are encrypted by the intercepted binary chaotic sequence according to their location information.The experimental results show that the algorithm has good image scrambling effect and better safety.

关 键 词：混沌系统 位分解 图像置乱 平凡密钥 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]