Cryptology ePrint Archive: BibTeX Citation of Report 2008/509

@misc{cryptoeprint:2008:509,
    author = {Jian Weng and Robert H. Deng and Shengli Liu and Kefei Chen and Junzuo Lai and Xuan Wang},
    title = {Chosen-Ciphertext Secure Proxy Re-Encryption without Pairings},
    howpublished = {Cryptology ePrint Archive, Report 2008/509},
    year = {2008},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.