Cryptology ePrint Archive: BibTeX Citation of Report 2012/224

@misc{cryptoeprint:2012:224,
    author = {Jie Chen and Hoon Wei Lim and San Ling and Huaxiong Wang and Hoeteck Wee},
    title = {Shorter IBE and Signatures via Asymmetric Pairings},
    howpublished = {Cryptology ePrint Archive, Report 2012/224},
    year = {2012},
    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.