基于行列异或的Arnold双置乱图像加密方法

针对目前加密图像单一以及加密算法安全性不高的问题，提出基于行列异或的Arnold双置乱图像加密方法。实施过程：首先根据Arnold变换公式对图像进行灰度空间置乱和位置空间置乱，然后进行行按位异或操作，其次，将上述结果再进行一次位置空间置乱，最后再进行列按位异或运算。该方法有效增强了传统Arnold双置乱的置乱效果，使图像得到充分扩散，最终得到密文图像。实验结果表明，本文方法能实现等长和不等长图像的置乱，改善了常规Arnold方法的置乱效果，有效降低了图像相邻像素间的相关性，保证了图像传输过程中的安全性和鲁棒性要求。

Arnold Dual- Scrambling Image Encryption based On Rows and Columns Bitwise XOR Operation

In order to solve the problem of single type of encrypted images and low security of encryption algorithm, we propose the Arnold dual- scrambling image encryption method based on rows and columns bitwise XOR operation. Firstly, the image is scrambled in grey space and position space according to the Arnold transform formula, then the line-by-line bitwise XOR operation is performed. Second, the above result is then subjected to another positional space permutation, and finally a column-by-column bitwise XOR operation is carried out. With this method, the scrambling effect of traditional Arnold dual-scrambling could be effectively enhanced, which allows the image to be fully diffused and result in encrypted images. The experimental results show that this method can achieve the scrambling of arbitrary size images, improve the scrambling effect of conventional Arnold method, effectively reduce the correlation between adjacent pixels of the image, and ensure the security and robustness of the image transmission process.