Cryptology ePrint Archive: BibTeX Citation of Report 2009/080

@misc{cryptoeprint:2009:080,
    author = {Michael Backes and Dennis Hofheinz and Dominique Unruh},
    title = {CoSP: A General Framework For Computational Soundness Proofs},
    howpublished = {Cryptology ePrint Archive, Report 2009/080},
    year = {2009},
    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.