An Image Scrambling Algorithm Based on Wavelet Transform and Knight’s Tour

Image secure transmission is one of the main research issues in the field of network communications. Many typical image encryption techniques take the direct way of scrambling the transmitted image itself, which may limit the scrambling effect that is achievable. A new image encryption algorithm is proposed in this paper. This algorithm uses various knight-tours on the chessboard as the basic tool for image scrambling, and scrambles the wavelet coefficients of the transmitted image instead of the image itself. Experimental results show that the algorithm can achieve better scrambling effect. Some useful conclusions are obtained through the analysis and explanation of the experimental data, which lay a solid foundation for further research.