Cryptology ePrint Archive: BibTeX Citation of Report 2013/128

@misc{cryptoeprint:2013:128,
    author = {Sanjam Garg and Craig Gentry and Shai Halevi and Amit Sahai and Brent Waters},
    title = {Attribute-Based Encryption for Circuits from Multilinear Maps},
    howpublished = {Cryptology ePrint Archive, Report 2013/128},
    year = {2013},
    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.