公开可验证的零知识水印检测

Publicly Verifiable Zero-Knowledge Watermark Detection

对称水印方案的水印检测密钥可以被用来伪造和移去水印,因此要求它在检测过程中也是保密的.零知识的水印检测方案利用密码学中零知识和知识证明的思想和算法,实现在水印检测时使得验证者确信水印存在性的同时又不泄漏水印检测密钥.提出了公开可验证的零知识水印检测的安全需求,给出一个公开可验证的承诺方案和一个证明知道被承诺值的离散对数的零知识知识证明协议.在此基础上提出了一个公开可验证的零知识水印方案,并讨论了它的安全性.

As the detection key in symmetric watermarking scheme can be used to forge or remove watermarks from digital works, it is required that the detection key be secret in watermark detection procedures. Based on zero-knowledge and proof of knowledge concepts and protocols in Cryptology, zero-knowledge watermark detection protocols can make the verifier believe the presence of a watermark in a disputed digital work while not compromising the detection key. The security requirements of a publicly verifiable zero-knowledge watermark detection scheme are outlined in this paper. Then a publicly verifiable commitment scheme and a zero-knowledge proof of knowledge protocol which proves knowing the discrete logarithm of a committed value are presented. Finally, using the above scheme and protocol as building blocks, a publicly verifiable zero-knowledge watermark detection protocol is proposed and its security considerations are addressed.