一种基于矩阵变换的非对称图像加密算法

为提高图像数据的加解密速度与安全性，提出了一种新的非对称图像加密算法．算法原理是基于某种矩阵变换，使得原始图像每一分块像素及其频域产生置乱．具体实现上。首先利用矩阵变换产生密钥对；然后使用私钥对图像在变换域进行加密；最后接收方用公钥解密加密的图像．由于该算法是基于矩阵变换的，具有实现方便，加解密快速的特点；非对称的加密机制则使得数据加密更具安全性．同时，为了进一步提高矩阵变换的安全性，引入了第二种加密机制，将伪随机的高斯白噪声加载到变换矩阵上．分析表明。这种方法对于加密大容量数据尤其是数字图像特别有用．

An asymmetric encryption algorithm for images based on matrix transformation

On the basis of a certain matrix transformation, a novel asymmetric encryption algorithm for image was proposed to scramble all the pixels and frequencies in each block of the original images. The proposed algorithm was especially useful for the encryption of large amounts of data, such as digital images, and had been implemented. A pair of keys was created through the matrix transformation. The image was encrypted by using private key in its transformation domain. The encrypted messages were decrypted by the receiver with the help of the public key. This algorithm was easily implemented and highly efficient to quickly encrypt and decrypt image messages. The asymmetric encryption mechanism made the encrypted data more secure. The second encryption schema was used to produce transformation matrix by pseudo-random Gauss white noise to farther improve the security of matrix transformation.