计算机与现代化

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基于改进Logistic混沌映射的图像自适应加密算法

  

  1. 西安邮电大学电子工程学院,陕西西安710121
  • 收稿日期:2016-03-16 出版日期:2016-07-21 发布日期:2016-07-22
  • 作者简介: 刘睿(1977-),女,陕西西安人,西安邮电大学电子工程学院讲师,硕士,研究方向:图像处理,信息安全,视频信号处理。
  • 基金资助:
     陕西省自然科学基金资助项目(2014JM8331,2014JQ5183); 陕西省教育厅科研计划项目(14JK1653)

 Self-adaptive Image Encryption Algorithm Based on Improved Logistic Chaotic Map

  1. College of Electronic Engineering, Xi’an University of Posts & Telecommunications, Xi’an 710121, China
  • Received:2016-03-16 Online:2016-07-21 Published:2016-07-22

摘要:

 针对一维Logistic混沌映射迭代序列分布非均匀,处于混沌状态的参数空间较小等问题,在映射原型基础上,增加非线性调节项和控制参数构造改进映射,经过分析证明改进映射具有更大
的混沌范围,更均匀的序列分布,更多正的Lyapunov指数。设计一种基于改进映射的自适应图像加密策略,使改进映射的初值随明文信息自适应改变,且对明文的各种细微改变均非常敏感。通过理论分
析和仿真实验表明,算法的安全性较高,能够抵御统计性分析和攻击性操作。

关键词:  , Logistic映射, 图像加密, 自适应, Lyapunov指数, 位分解

Abstract:

 In order to solve the problem that the iterative sequences produced by the one-dimension(1D) Logistic chaotic map are uneven distribution and the parameter
space of chaos is smaller, an improved Logistic map was constructed by increasing the control parameter and nonlinear adjustment in the Logistic chaotic map, which has a wider
chaotic range and more uniform distribution than its prototype by analyzing bifurcation diagram and Lyapunov exponent. A self-adaptive image encryption scheme based on improved
Logistic chaotic map was introduced, and the initial value of improved Logistic chaotic map is adaptive change with the plain image, and the scheme is sensitive to all sorts of
subtle change of the plain image. Experiments and security analysis indicate that the algorithm has high security, and can resist statistical analysis and attack operation.

Key words:  Logistic map, image encryption, self-adaptive, Lyapunov exponent, bit decomposition