Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (21): 191-194.

• 图形、图像、模式识别 • Previous Articles     Next Articles

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

LU Ping1,DONG Husheng1,MA Xiaohu2   

  1. 1.Department of Information,Suzhou Institute of Trade & Commerce,Suzhou,Jiangsu 215009,China
    2.School of Computer Science & Technology,Soochow University,Suzhou,Jiangsu 215021,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-07-21 Published:2011-07-21

基于混合混沌与位分解的图像置乱改进算法

陆 萍1,董虎胜1,马小虎2   

  1. 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

Abstract: 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.

Key words: chaos system, bit decomposition, image scrambling, invalid-key

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。

关键词: 混沌系统, 位分解, 图像置乱, 平凡密钥