Cryptology ePrint Archive: BibTeX Citation of Report 2011/479

@misc{cryptoeprint:2011:479,
    author = {Mihir Bellare and Eike Kiltz and Chris Peikert and Brent Waters},
    title = {Identity-Based (Lossy) Trapdoor Functions and Applications},
    howpublished = {Cryptology ePrint Archive, Report 2011/479},
    year = {2011},
    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.