一种基于混沌映射的图像分组加密算法

A packet encryption algorithm based on chaotic mapping

为了提高信息加密安全性,提出一种三角混沌映射与拟分组加密算法相结合的图像加密方法。利用三角混沌映射产生混沌序列,将该混沌映射产生的混沌序列量化为离散二值序列,分析该混沌序列的性能参数指标,最后将三角混沌作为密钥用于改进的拟Feistel结构加密算法。通过对加密后图像相邻像素灰度共生矩阵指标进行实验分析,结果表明加密后图像相邻像素具有良好的空间随机特性。

In order to improve the security of image encryption, a new image encryption method combined with the chaotic map and the triangular chaotic map is proposed. Firstly, the triangular chaotic sequence generated by the triangular chaotic map is quantified into discrete binary se- quence. Secondly, the random properties of binary sequence are analyzed. In the end, the trian- gular chaotic map is applied to the improved encryption algorithm based on quasi-feistel structure. The encrypted image is analyzed with gray level co-occurrence matrix （GLCM）. The results show that the neighborhood pixels of encrypted image have good performance of space ran- dom uniform distribution.