Cryptology ePrint Archive: BibTeX Citation of Report 2007/233

@misc{cryptoeprint:2007:233,
    author = {Michael Backes and Markus Duermuth and Ralf Kuesters},
    title = {On Simulatability Soundness and Mapping Soundness of Symbolic Cryptography},
    howpublished = {Cryptology ePrint Archive, Report 2007/233},
    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.