基于复合混沌系统的数字图像加密方法研究

Research on digital image encryption method based on hybrid chaotic system

分析了现有图像加密方法的安全性,提出了一种改进的图像加密方法,将两套Logistic映射组合起来构成参数变化的双Logistic映射复合混沌系统,系统中的Logistic映射相互控制对方的μ参数,并产生两个混沌序列。然后用其中一个混沌序列对图像矩阵进行置乱,另一个混沌序列用于对图像信息进行异或加密。计算机仿真结果表明,该加密方法具有良好的加密效果,具有可行性,算法实现简洁,有较强的抗攻击和抗噪声能力。

The security of image encryption methods was analyzed, and improved method of image encryption named changing parameters and chaotic complex system of double Logistic-maps was presented, which consisted of two sets of Logistic-maps. In this system, the two Logistic-maps can control the parameter μof each other and thus produce two chaotic sequences. Then one of the sequences is used to disturb the image matrix, while the other sequence to encrypt the image. The computer simulation results proved that the method is easy, feasible, and effective in encryption. Besides, this method is also well against attack and noises.