Cryptology ePrint Archive: BibTeX Citation of Report 2011/700

@misc{cryptoeprint:2011:700,
    author = {Tatsuaki Okamoto and Katsuyuki Takashima},
    title = {Efficient Attribute-Based Signatures for Non-Monotone Predicates in the Standard Model},
    howpublished = {Cryptology ePrint Archive, Report 2011/700},
    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.