混沌图像加密算法安全性能研究

Research on Security Performance of Chaotic Image Encryption Algorithm

混沌加密是图像加密领域一个重要的研究方向,加密算法的安全性及鲁棒性等是衡量算法优劣的重要指标。通过对混沌加密算法的一般过程的简要总结,提出基于混沌系统图像加密算法安全性能分析的四个主要指标:图像的信息熵、加密前后变化度、平均互信息量及密钥敏感性等,对基于Logisitc混沌系统加密的图像分别进行测试。并用MATLAB进行模拟实验,将给出的四个指标对基于Logisitc混沌系统图像加密算法进行测试,实验结果表明其在抵御统计分析、差分攻击、暴力攻击、阻断攻击和噪声攻击等方面较为理想。

Chaotic encryption is an important research direction in the field of image encryption.The security and robustness of encryption algorithm are important indicators to measure the quality of the algorithm.Through a brief summary of the general process of chaotic encryption algorithm,this paper proposes four main indicators of security performance analysis of image encryption algorithm based on chaotic system:information entropy of image,change degree before and after encryption,average mutual information and key sensitivity,etc.The images encrypted by Logisitc chaotic system are tested respectively.MATLAB is used for simulation experiments,and the four indicators given are tested on the image encryption algorithm based on Logisitc chaotic system.Experimental results show that it is ideal in resisting statistical analysis,differential attack,violent attack,blocking attack and noise attack.