Cryptology ePrint Archive: BibTeX Citation of Report 2007/200

@misc{cryptoeprint:2007:200,
    author = {Philip Atzemoglou and Tal Malkin},
    title = {ProSiBIR: Proactive Signer-Base Intrusion Resilient Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2007/200},
    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.