Image Authentication Scheme using Digital Signature and Digital Watermarking

Usual digital signature schemes for image authentication encode the signature in a file separate from the original image, so this process require extra bandwidth to transmit it. Meantime, watermarking is an information hiding sub-discipline that embeds some information into host image. In this paper a joined digital signature and digital watermarking scheme for image authentication is proposed which is based on signature generation method purposed by [4] and combined DWT-DCT watermark embedding procedure [3]. The scheme extracts signature from the original image and embeds them back into the image as watermark which leads to avoiding additional signature file.