A SVD-based fragile watermarking scheme for image authentication

A fragile watermarking scheme is proposed for authentication of images. We exploit singular values of singular value decomposition (SVD) of images to check, the integrity of images. In order to make authentication data, the singular values are changed to the binary bits using modular arithmetic. The binary bits, authentication data, are inserted into the least significant bits (LSBs) of the original image. The pixels to be changed are randomly selected in the original image. The advantages of this scheme are that i), we can detect any modification of watermarked images, ii) the quality of watermarked images is very high because only a few bits of authentication data are embedded. We also propose an extension algorithm to provide localization. Experimental results show that the proposed fragile watermarking scheme can be applied to the authentication applications.