Cryptology ePrint Archive: BibTeX Citation of Report 2012/398

@misc{cryptoeprint:2012:398,
    author = {Travis Mayberry and Erik-Oliver Blass and Agnes Hui Chan},
    title = {PIRMAP: Efficient Private Information Retrieval for MapReduce},
    howpublished = {Cryptology ePrint Archive, Report 2012/398},
    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.