Cryptology ePrint Archive: BibTeX Citation of Report 2006/068

@misc{cryptoeprint:2006:068,
    author = {Michael Backes and Birgit Pfitzmann and Michael Waidner},
    title = {Limits of the Reactive Simulatability/UC of Dolev-Yao Models with Hashes},
    howpublished = {Cryptology ePrint Archive, Report 2006/068},
    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.