A blind wavelet based digital signature for image authentication

A content based digital image signature scheme for image authentication is proposed. The signature is implemented by image watermarking in the wavelet domain. We introduce interdependency between the watermark and the image data sequence, so that the detection and verification of the signature are independent of the original image and the knowledge of the original watermark sequence or location are not needed. The signature is embedded and tested within the Entropy Zerotree Wavelet Coding (EZW) model. The information capacity of the algorithm is determined.