Visible Watermarking using Verifiable Digital Seal Image

--Many watermarking methods for protecting the intellectual property right and authenticating multimedia data have been proposed in recent years. It is possible to guarantee the authenticity of data using readable and fragile watermarking. In this paper, we propose a visible watermarking technique using verifiable digital seal image that is based on the concept of fragile watermarking. Seal image is just a binary (black or white) information after it converted to digital data by scanning. But, by adding digital signature to the seal image with a watermarking technique, we can get a verifiable digital seal image. The digital seal image can be used as an authentication for a digital image as well as a digital document. Inserted to digital image as a visible watermark, it guarantees the authenticity of cover image. This paper shows how to construct the verifiable digital seal image and how to apply it to cover image. Results are demonstrated by simulations. Keyword : watermarking, signature, verifiable digital seal image