Cryptology ePrint Archive: BibTeX Citation of Report 2006/454

@misc{cryptoeprint:2006:454,
    author = {Jan Camenisch and Susan Hohenberger and Markulf Kohlweiss and Anna Lysyanskaya and Mira Meyerovich},
    title = {How to Win the Clone Wars: \\ Efficient Periodic n-Times Anonymous Authentication},
    howpublished = {Cryptology ePrint Archive, Report 2006/454},
    year = {2006},
    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.