基于Arnold变换的改进图像加密算法研究

随着现在图像破译技术的提高，传统的基于Arnold变换的置乱算法仅适用于正方形区域，存在很大的局限性，已经远远不能保证图片在传送过程中的安全性了。提出了一种新的多区域置乱算法的图像加密模型，即对于非正方形图像采用划分多区域，分别对每个区域进行置乱的思想。实验数据显示，新算法不仅有效地提高了图像的安全性，使破译起来无从下手，而且对置乱后的图像恢复，与原图几乎是一样的，达到了图像安全、可靠传输的目的。

Method of improved image scrambling based on Arnold transform

With the development of information security, the traditional scrambling algorithm based on Arnold transformation is only applied to the square area, which is a big limitation. It has been far from to ensure the security of images in the transmission process. This paper presents a new image encryption algorithm, which can improve the security of?image during transmission more effectively. Focus on this, a multi-region algorithm for image scrambling encryption model is proposed, which splits the non-square image to multiple square regions, and scrambles each region. Experimental results show that the new algorithm improves the image security effectively to avoid decipher, and it also can restore the image almost as same as the original image, which reaches to the purposes of image safe and reliable transmission.