Cryptology ePrint Archive: BibTeX Citation of Report 2014/608

@misc{cryptoeprint:2014:608,
    author = {Ferucio Laurentiu Tiplea and Constantin Catalin Dragan},
    title = {Key-policy Attribute-based Encryption for  Boolean Circuits from Bilinear Maps},
    howpublished = {Cryptology ePrint Archive, Report 2014/608},
    year = {2014},
    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.