一种基于小波变换和骑士巡游的图像置乱算法

由于图像或视频数据在网络中(特别是在无线网络中)进行传输时，很容易被非法截取，人们对多媒体数据传输的安全性提出了很高的要求，许多典型的图像加密方法都是对传输图像的像素直接进行置乱，这使图像置乱的程度受到了限制；也有一些方法是对变换域的变换系数置乱．提出了一种新的图像置乱加密算法，其基本思想是首先将原图像进行小波分解，然后以棋盘上的骑士巡游线路为工具，充分利用小波子带的特点将小波系数进行置乱，这为图像加密提供了一种全新的思路，通过与传统的置乱算法做比较，验证了本算法能够获得更好的置乱效果，并通过对实验数据的分析和解释得到了若干有益的结论，为进一步的研究工作奠定了基础。

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.