Analysis of Random Mixed Image Encryption Algorithm Based on QoS

In this paper, a hybrid chaos image encryption method which distinguishes the transmission quality of communication network is proposed. The algorithm combines chaos encryption algorithm with wavelet transform. First, the digital image is decomposed by wavelet to generate approximate image, low-frequency horizontal component, low-frequency vertical component and high-frequency component. The communication parties can encrypt only approximate graph in the network with poor transmission quality by using the random hybrid chaos time series proposed in this paper. In the good transmission quality network, each component can be encrypted and transmitted at the same time. Finally, the original image can be restored lossless by wavelet reconstruction. The experimental results show that the auto-correlation, cross-correlation, run-length and balance characteristics of the encryption sequences generated by this algorithm are excellent. On the premise of avoiding the complex operation of high-dimensional chaos mapping, the encryption intensity and cracking difficulty of the system are greatly improved, and the problem of image security requirements under different conditions is effectively solved.