Image Encryption Algorithm Based on Wavelet Transforms and Dual Chaotic Maps

In view of characteristics of digital image,such as bulk data capacity,high redundancy and poor security, a new image encryption algorithm was put forward by combining chaotic maps with wavelet transform. Mallat algorithm in wavelet transform firstly was used to decompose the original image, leaving only the lowfrequency information, and then oversampled Chebyshev chaotic maps were used to achieve space chaos of compressed image, oversampled Logistic chaotic maps were used for encryption. Finally, security analysis of the encryption algorithm are analyzed from the perspective of key space, statistical analysis, key sensitivity analysis and so on. Simulation results show that the method can effectively compress image, the amount of information transmission is low and the key space is large enough to resist the bruteforce attack and with good encryption effect.