Cryptology ePrint Archive: BibTeX Citation of Report 2007/451

@misc{cryptoeprint:2007:451,
    author = {Omkant Pandey and Rafael Pass and Amit Sahai and Wei-Lung Dustin Tseng and Muthuramakrishnan Venkitasubramaniam},
    title = {Precise Concurrent Zero Knowledge},
    howpublished = {Cryptology ePrint Archive, Report 2007/451},
    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.