@misc{cryptoeprint:2007:396,
    author = {Jun Shao and Zhenfu Cao and Licheng Wang and Xiaohui Liang},
    title = {Proxy Re-Signature Schemes without Random Oracles},
    howpublished = {Cryptology ePrint Archive, Report 2007/396},
    year = {2007},
    url = {http://eprint.iacr.org/2007/396},
}