@misc{cryptoeprint:2002:177,
    author = {Jianhong Zhang Jilin Wang Yumin Wang},
    title = {two attacks on xia-you Group Signature},
    howpublished = {Cryptology ePrint Archive, Report 2002/177},
    year = {2002},
    url = {http://eprint.iacr.org/2002/177},
}