A Novel Image Encryption Algorithm Based on Lifting-Based Wavelet Transform

In order to trade-off between computational effects and computational cost of present image encryption algorithm, a novel image encryption algorithm based on lifting-based wavelet transform is proposed in this paper. The image encryption process includes three steps: first the original image was divided into blocks, which were transformed by lifting based wavelet, secondly the wavelet domain coefficients were encryption by random mask which generated by user key, and finally employing Arnold scrambling to encrypt the coefficients. The security of proposed scheme is depended on the levels of wavelet transform, user key, and the times of Arnold scrambling. Theoretical analysis and experimental results demonstrate that the algorithm is favourable.