新的图像加密方法

针对数字图像信息数据量大、冗余度高和像素间相关性强等特点,提出了一种基于二元多项式的图像加密新方法。在对图像的加密过程中,该方法使用另一幅图像作为密钥,使得密钥形象直观且伪装性强,而密钥图像的尺寸可以远远小于加密图像,便于保存。因加密的大部分步骤中只用到了有限域的加法运算,因此该算法的加密效率较高。该加密方法不仅有安全性高和便于图像的局部加密等优点,还可以方便地推广到视频的图像加密领域,具有很好的应用前景。

New Class of Image Encryption Method

Digital images have many intrinsic features such as large amount of data information,highly redundancy,and strong correlation among pixels and so on.A new method of image encryption based on bivariate polynomials is proposed according to the characters of images.In the process of image encryption,another digital image is used as the key,in this way the size of the image key could be much smaller than the secret image.The majority of steps of encryption and decryption just are add operations over a finite field,so the new method has highly efficiency.In addition,the method can be expanded to the video encryption field easily.