Cryptology ePrint Archive: BibTeX Citation of Report 2007/264

@misc{cryptoeprint:2007:264,
    author = {Thomas Ristenpart and Scott Yilek},
    title = {The Power of Proofs-of-Possession: Securing Multiparty Signatures against Rogue-Key Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2007/264},
    year = {2007},
    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.