Mahmoud R. El-Sakka and Abdelkader H. Ouda, "A New
correlational-based Scheme for Image Verification and
Authentication", SPIE International Conference on Security
and Watermarking of Multimedia Contents III, January 2001,
San Jose, California, USA.
With a rapid growth of digital image distributions, there has
been a corresponding surge in digital counterfeiting of
confidential documents. Secrecy of documents and copyright
protection techniques have been introduced in an attempt to
address this growing concern. Recently, digital image
watermarks have been proposed to copyright image data.
In this paper a new Digital Image Authentication System is
proposed. This system is designed to detect any small change
made in an image, including any alteration in pixel values or
image size. It uses a watermarking scheme, which is based on
correlation coefficient statistics, the Secure Hash Algorithm
(SHA-1), and the Elliptic Curve Digital Signature algorithm
(ECDSA). The generated signature is then embedded in the image
spatial domain. Experimental results show that this system has
the ability to accurately authenticate images, while
preserving their quality.