@misc{cryptoeprint:2004:104,
    author = {Lan Nguyen and Rei Safavi-Naini},
    title = {Efficient and Provably Secure Trapdoor-free Group Signature Schemes from Bilinear Pairings},
    howpublished = {Cryptology ePrint Archive, Report 2004/104},
    year = {2004},
    url = {http://eprint.iacr.org/2004/104},
}