Fingerprinting protocol applies a watermarking techniques to embed a fingerprinting information in a digital content such as music, image, movie, etc.. The cryptographic protocol is studied by many researchers, but how to apply watermarking techniques is not remarked. In this paper, we study the problem to implement the watermarking techniques in the fingerprinting protocol, and then propose an ingenious method to embed a fingerprinting information in a digital image. The alteration of the embedded information is difficult for a hostile buyer in our scheme.