Cryptology ePrint Archive: BibTeX Citation of Report 2012/100

@misc{cryptoeprint:2012:100,
    author = {Shahram Khazaei and Bj{\"o}rn Terelius and Douglas Wikstr{\"o}m},
    title = {Cryptanalysis of a Universally Verifiable Efficient Re-encryption Mixnet},
    howpublished = {Cryptology ePrint Archive, Report 2012/100},
    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.