一种基于忆阻时滞混沌系统的图像加密方法

An image encryption method based on memristive time-delay chaotic system

在广义记忆元件数学模型的基础上,提出了一种忆阻时滞混沌系统并分析了该系统的基本动力学特性;基于该混沌序列设计了一种双重扩散的图像加解密方法,通过取模和位异或运算将第一次加密的结果运用到第二次加密的过程中,从而将明文图像在各个位置像素值的影响渗透到加密图像的所有像素中,能有效减少明文和密文间的联系.试验结果的直方图、相关性、密钥敏感性和抗噪声分析等验证了加密效果,表明了该方法的有效性和可行性.

Based on the mathematical model of generalized memristive devices,a memristive time-delay chaotic system was proposed and the basic dynamic characteristics of it was analyzed.A dual diffusion image encryption and decryption algorithm was designed based on the sequence of it.Through the nonlinear operations such as modulo and XOR,the plaintext,ciphertext and secret key were influenced mutually other,and the connection between plaintext and ciphertext was reduced effectively.Moreover,the effect of encryption was verified by the analysis of histogram,correlation,key sensitivity and antinoise attack.Correspondingly,the validity and feasibility of the algorithm were proved by the numerical results.