基于混沌系统的彩色图像小波域加密算法

A wavelet domain encryption algorithm for color image based on chaotic system

由于高维混沌系统具有更高的安全性,且密钥空间更大,提出一种基于三维Lorenz混沌系统的彩色图像小波域加密算法.首先对图像进行小波处理,对得到的小波域系数矩阵进行多次分块置乱,以提高置乱效率;然后采用扩散和置乱同时进行的方式减少算法的遍历次数.仿真实验结果表明:该算法具有良好的加密效果和很强的密钥敏感性,能够抵抗暴力破解和其他干扰,具有较高的安全性与实用性.

High-dimensional chaotic system has a higher level of security and a larger key space. A wavelet domain eneryption algorithm for color image based on 3D Lorenz chaotic system is proposed. First, the image is processed with wavelet, then the multi-level block scrambling is applied in the coefficient matrix obtained in the wavelet domain, to im- prove the efficiency of scrambling. The proliferation and scrambling are performed simultaneously, to reduce the level of al- gorithms traverse. The simulation results show that the algorithm has good effects and strong encryption key sensitivity, and can be resistant to brute force attack and other interference, so it has higher safety and practicality.