Conventional digital signature schemes for image authentication encode the signature in a file separate from the original image, thus require extra bandwidth to transmit it. Meantime, the watermark technique embeds some information in the host image. In this paper, a combined digital watermark and digital signature scheme for image authentication is proposed. The scheme extracts signature from the original image and embeds them back into the image as watermark, avoiding additional signature file. Since images are always compressed before transmission in the Internet, the proposed scheme is tested for compression tolerance and shows good robustness against P E G coding. Furthermore, the scheme not only can verlfy the authenticity and the integrity of images, but also can locate the illegal modifications.
Chen proposed an image authentication scheme combines digital signature and watermarking REF , which extracts signature from the original image and embeds them back into the image as watermark and avoid additional signature bandwidth for transmission, the algorithm shows not only tolerate JPEG compression but also able to locate the illegal modifications.
Combined digital signature and digital watermark scheme for image authentication
2001 International Conferences on Info-Tech and Info-Net. Proceedings (Cat. No.01EX479)
2001 International Conferences on Info-Tech and Info-Net. Proceedings (Cat. No.01EX479)
Computer Science