@misc{cryptoeprint:2004:315,
    author = {Qin Wang, Zhenfu Cao},
    title = {Security Arguments for Partial Delegation with Warrant Proxy Signature Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2004/315},
    year = {2004},
    url = {http://eprint.iacr.org/2004/315},
}