@misc{cryptoeprint:2004:047,
    author = {Yodai Watanabe},
    title = {On a zero-knowledge property of arguments of knowledge based on secure public key encryption schemes},
    howpublished = {Cryptology ePrint Archive, Report 2004/047},
    year = {2004},
    url = {http://eprint.iacr.org/2004/047},
}