On the design of a robust and secure digital signature scheme for image authentication over wireless channels

The invasive distribution of digital images and the growing concern on their integrity and originality triggers an emergent need of authenticating corrupted images by transmission. To meet this need, this paper proposes a content-based image authentication scheme that exploits structural digital signature scalability in order to achieve a good tradeoff between security and data transfer. In the proposed scheme, multiscale features are used to make digital signatures robust to image degradations and key-dependent parametric wavelet filters are employed to improve the security against forgery attacks. Furthermore, the proposed scheme is able to distinguish tampering areas in the attacked image. Experimental results demonstrate the effectiveness and validity of the proposed scheme.