Cryptology ePrint Archive: BibTeX Citation of Report 2014/482

@misc{cryptoeprint:2014:482,
    author = {Fabienne Eigner and Aniket Kate and Matteo Maffei and Francesca Pampaloni and Ivan Pryvalov},
    title = {Differentially Private Data Aggregation with Optimal Utility},
    howpublished = {Cryptology ePrint Archive, Report 2014/482},
    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.