基于时钟变换的复合混沌图像加密研究

为解决一维混沌加密系统密钥空间和安全性差等问题，提出了一种基于时钟变换的复合混沌图像加密方法。该算法使用分段线性混沌映射，k阶Chebychev映射以及一维Logistic
映射相复合的方式产生像素位置置乱矩阵和像素值变换矩阵。利用系统时钟变化法，随机改变复合混沌系统的多级初始参数，从而提高了图像信息传输的安全性，达到了近似“一次一密”的安全思想。采用MatLab7.0仿真实现。结果表明，该算法具有良好的加密效果且密钥空间较大。

Research on Compound Chaos Image Encryption Method with Time-Varying

In order to solve the one-dimensional chaotic encryption key space and the poor security,a composite based on the clock to transform the chaotic image encryption method.The algorithm uses piecewise linear chaotic maps,k-order Chebychev maps and one-dimensional Logistic map phase composite way to generate the pixel position of scrambling matrix and the pixel value transformation matrix.Use of system clock change,random changes in the level of initial parameters of the hybrid chaotic system,thereby enhancing the security of the transmission of image information,and reached a similar "one secret" security thinking.The simulation realization MatLab7.0.The results show that the algorithm has good encryption key space.