@misc{cryptoeprint:2009:164,
    author = {Jun Shao and Zhenfu Cao},
    title = {CCA-Secure Proxy Re-Encryption without Pairings},
    howpublished = {Cryptology ePrint Archive, Report 2009/164},
    year = {2009},
    url = {http://eprint.iacr.org/2009/164},
}