Cryptology ePrint Archive: BibTeX Citation of Report 2012/687

@misc{cryptoeprint:2012:687,
    author = {Karyn Benson and Hovav Shacham and Brent Waters},
    title = {The k-BDH Assumption Family: Bilinear Map Cryptography from Progressively Weaker Assumptions},
    howpublished = {Cryptology ePrint Archive, Report 2012/687},
    year = {2012},
    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.