Reversible Semi-Fragile Authentication Watermark

Reversible semi-fragile authentication watermark (RSAW) is required in an integrated and powerful authentication system. An effective RSAW scheme should have the desirable features: tamper detection and localization, good perceptual invisibility, detection without requiring explicit knowledge of the original image, robustness against lossy compression, noise attack and low-pass filtering to some extent, reversibility on condition that marked image has not been disturbed, and high security against forge attack. To our best knowledge, RSAW schemes that are presented in the literature are not effective enough. This paper proposes a new RSAW scheme which is effective and has additional features as tamper discerning, computational efficiency and multiple encryption keys supporting. Experimental results demonstrate the validity of the proposed RSAW scheme.