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对“改进遍历矩阵和像素值扩散的图像加密算法”的密码分析
引用本文:杨吉云,田维兴,周发贵.对“改进遍历矩阵和像素值扩散的图像加密算法”的密码分析[J].计算机应用,2014,34(9):2656-2658.
作者姓名:杨吉云  田维兴  周发贵
作者单位:1. 重庆大学 计算机学院,重庆 400044; 2. 78020部队,昆明 650223
摘    要:最近提出了一个基于混沌的改进遍历矩阵和像素值扩散的图像加密算法,该加密算法首先将Logistic混沌映射构造一个遍历矩阵用于在图像空域迭代置换,然后再采用一个新的混沌序列对像素值进行扩散。通过对该加密算法的分析,找出了该算法存在的安全漏洞,从而提出了选择明文/已知明文的攻击方法,通过选择特殊的明文图像及其对应的密文图像,可在未知密钥的条件下对同样大小的密文图像进行破解。仿真实验结果表明这种攻击方法非常有效。

关 键 词:混沌  图像加密  密码分析  选择明文攻击  遍历矩阵
收稿时间:2014-04-11
修稿时间:2014-06-06

Cryptanalysis of Image encryption algorithm based on improved ergodic matrix and pixel value diffusion
YANG Jiyun,TIAN Weixing,ZHOU Fagui.Cryptanalysis of Image encryption algorithm based on improved ergodic matrix and pixel value diffusion[J].journal of Computer Applications,2014,34(9):2656-2658.
Authors:YANG Jiyun  TIAN Weixing  ZHOU Fagui
Affiliation:1. College of Computer Science, Chongqing University, Chongqing 400044, China
2. Army of 78020 Troops, Kunming Yunnan 650223, China
Abstract:Recently, an image encryption algorithm based on improved ergodic matrix and pixel value diffusion was proposed, where an ergodic matrix was constructed to be used in the iterative permutation of the spatial image by means of the Logistic chaotic mapping and then the pixel value diffusion was realized according to a new chaotic sequence. According to the analysis of this algorithm, the security hole could be found, so the chosen/known plaintext attack method was put forward to reveal the secret key, and recovered the ciphertext image of the same size by choosing some special plaintext images and the corresponding ciphertext images without the secret key. And the simulation results illustrate the effectiveness of the proposed attack method.
Keywords:chaos  image encryption  cryptanalysis  chosen plaintext attack  ergodic matrix
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