Cryptology ePrint Archive: BibTeX Citation of Report 2006/047

@misc{cryptoeprint:2006:047,
    author = {Christoph Sprenger and Michael Backes and David Basin and Birgit Pfitzmann and Michael Waidner},
    title = {Cryptographically Sound Theorem Proving},
    howpublished = {Cryptology ePrint Archive, Report 2006/047},
    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.