Cryptology ePrint Archive: BibTeX Citation of Report 2010/159

@misc{cryptoeprint:2010:159,
    author = {Mihir Bellare and Brent Waters and Scott Yilek},
    title = {Identity-Based Encryption Secure against Selective Opening Attack},
    howpublished = {Cryptology ePrint Archive, Report 2010/159},
    year = {2010},
    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.