Fragile watermarking for image authentication based on image feature and public key cryptography
基于图像特征和公钥密码系统的易损水印算法

A new invisible watermarking technique which could localize tampered areas for image authentication was proposed, based on image feature and public key cryptography. According to image feature and secret key a logo was embedded as watermark for the integrity verification and localized tamper detection. The watermark extraction used a public key corresponding to the private key in embedding procedure. The new scheme not only resolves the security problem of most existing scheme to this day, but also permits public detection of the watermark by any person without the 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.