| 二维混沌映射图像加密安全性分析及改进算法 |
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| 引用本文： | 黄峰,冯勇.二维混沌映射图像加密安全性分析及改进算法[J].哈尔滨工业大学学报,2007,39(9):1411-1414. |
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| 作者姓名： | 黄峰 冯勇 |
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| 作者单位： | 1. 哈尔滨工业大学,电气工程及自动化学院,哈尔滨,150001;湖南工程学院,电气与信息工程系,湖南,湘潭,411104
2. 哈尔滨工业大学,电气工程及自动化学院,哈尔滨,150001 |
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| 摘 要： | 为增强图像加密的安全性,分析了二维混沌映射图像加密技术,提出了一种新的改进算法.采取构造复合加密系统、增加扩散函数、改变密钥设计等方法解决二维混沌映射加密图像时只改变图像位置,没有改变像素值,存在周期性、无扩散、实际密钥空间比理论值小等安全隐患问题.将Baker map公式化,然后利用复合混沌系统的思想,以Baker map为例提出了一种新的改进算法.仿真验证了改进算法的安全性.仿真表明,改进算法对其他二维混沌映射Cat map等均有效.
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| 关 键 词： | 混沌映射 Bakermap 图像加密 |
| 文章编号： | 0367-6234（2007）09-1411-04 |
| 修稿时间： | 2005-11-17 |
A new image encryption algorithm based on two-dimensional chaotic maps |
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| HUANG Feng,FENG Yong.A new image encryption algorithm based on two-dimensional chaotic maps[J].Journal of Harbin Institute of Technology,2007,39(9):1411-1414. |
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| Authors: | HUANG Feng FENG Yong |
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| Affiliation: | 1. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China, ;2. Dept. of Electrical and Information Engineering, Hunan Institute of Engineering, Xiangtan 411104, China |
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| Abstract: | In order to improve the security of image encryption,this paper analyzed the image encryption based on two-dimensional chaotic maps and proposed a new image encryption algorithm.Methods including adding diffusion mechanism,changing the design of key and developing composite encryption system were used to solve the problems in the image encryption of two-dimensional chaotic maps,such as beriodicity no diffusion and the real key space littler than the theoretical value.This paper formulized the Baker map.Then it proposed a new image encryption based on Baker map.The simulation results show that the proposed encryption algorithm is valid and fit for other two-dimensional chaotic map. |
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| Keywords: | chaotic map Baker map image encryption |
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