Cryptology ePrint Archive: BibTeX Citation of Report 2008/471

@misc{cryptoeprint:2008:471,
    author = {Endre Bangerter and Jan Camenisch and Stephan Krenn and Ahmad-Reza Sadeghi and Thomas Schneider},
    title = {Automatic Generation of Sound Zero-Knowledge Protocols},
    howpublished = {Cryptology ePrint Archive, Report 2008/471},
    year = {2008},
    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.