一种基于改进的Fibonacci变换的数字水印算法

为提高置乱算法的安全性，提出一种广义的二维矩阵置乱算法．．该算法有多个可选的矩阵，通过逆变换实现图像还原操作，攻击者想破解置乱算法是十分困难的。将所选用的矩阵和迭代次数作为水印的密钥，提高了算法的安全性、实验表明，在不同图像处理和攻击下，该算法具有鲁棒性好、安全性高、提取水印时不需要原始图像等优点。

Using Improved Fibonacci Hash Transform to Increase the Robustness of Meaningful Watermarking Algorithm

In order to enhance the security of hashing algorithm,the authors propose a generalized two dimensional matrix hashing algorithm. The algorithm has several optional matrices, and the image can be restored through reverse transform. Thus, it is very difficult to decode the hashing algorithm; the security is enhanced via using the selected matrix and iteration time as the secret keys. Numerical experiments show that, under various image processing and attacks, the proposed algorithm has such advantages as good robustness, high security, requiring not the original image for watermarking extraction, etc.