Cryptology ePrint Archive: BibTeX Citation of Report 2015/558

@misc{cryptoeprint:2015:558,
    author = {Oksana Kulyk, Stephan Neumann, Jurlind Budurushi, Melanie Volkamer, Rolf Haenni, Reto Koenig, Philemon von Bergen},
    title = {Efficiency Evaluation of Cryptographic Protocols for Boardroom Voting},
    howpublished = {Cryptology ePrint Archive, Report 2015/558},
    year = {2015},
    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.