Image Encryption Based on Bivariate Polynomials

Encryption of image is different from that of texts due to some intrinsic features of images: large amount of data, highly redundancy, strong correlation among pixels and so on. Therefore, the encryption result is not very well if we used the traditional encryption methods to encrypt images. The paper proposes a new method of image encryption based on bivariate polynomials; another image is used as the key in which method. Because the size of the image key could be much smaller than the secret image, we can hold it expediently. And the method can expand to the video encryption field, and has a good perspective.