Fragile authentication watermark combined with image feature and public key cryptography

In this paper, a new invisible watermarking technique can localize tampered areas for image authentication is proposed, which skillfully combined with image feature and public key cryptography. A logo is embedded based on image feature and secret key as watermark for the integrity verification and localized tamper detection. The watermark extraction uses a public key corresponds to the private key in embedding procedure. The new scheme not only can resolve the security problem tailing most existing scheme to this day, but also permits public detection of the watermark by any person without the secure exchange of a secret key, which is very important in many applications such as trusted camera and Web image authentication. Theoretical analysis and experiment results demonstrate its outstanding performance above.