1. Institution of Information Engineering， Wuhan University of Technology， Wuhan 430070；2. School of Science， Wuhan University of Technology， Wuhan 430070
Abstract：In order to solve the shortcomings of the traditional chaotic encryption system due to the precision degradation problem and the small key space as well as poor security performance caused by the finite precision effect of the computer， another chaotic map is designed based on the topological conjugate based on Logistic chaos. Then， the initial values of quantum logistic chaotic maps are generated through the new chaos map so that the scrambling matrices are derived from them. After that， two diffusion matrices are generated by using two piecewise linear chaotic maps. The diffusion-scrambling-diffusion method is used to encrypt the image， which greatly reduces the finite precision and the encryption space is improved. Finally， the performance of the encryption system have tested by MATLAB. The test results show that the encryption algorithm can be applied to the real-time encryption occasion.
2017, Vol. 51 
