Cryptology ePrint Archive: BibTeX Citation of Report 2013/154

@misc{cryptoeprint:2013:154,
    author = {Jan-Jaap Oosterwijk and Boris Skoric and Jeroen Doumen},
    title = {Optimal Suspicion Functions for Tardos Traitor Tracing Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2013/154},
    year = {2013},
    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.