Abstract:

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.

Key words: compound chaos, image encryption, chebychev mapping, logistic mapping, secret key