Image Encryption Algorithm Based on Unified Chaotic System and Lifting Wavelet Transformation

In order to tackle the security problem of image transmission across public networks, a new image encryption algorithm based on unified chaotic system and lifting wavelet transform is proposed in this article. Firstly, the image is decomposed horizontally and vertically by lifting wavelet transform to obtain sub band images. Secondly, utilizing the sort permutation and the binary XOR operation from the unified chaotic series, the algorithm can achieve the encryption of the sub band images. Thus, the recipient of the images can correctly restore the sub band images and reconstruct the original images by a decryption algorithm. Finally, the analysis of algorithm security is conducted with theory analysis and computer simulation. The experiment results demonstrate that the new chaotic encryption algorithm based on unified chaotic system and lifting wavelet transform is feasible and provides higher security.