Cryptology ePrint Archive: BibTeX Citation of Report 2009/480

@misc{cryptoeprint:2009:480,
    author = {Sanjit Chatterjee and Alfred Menezes},
    title = {On Cryptographic Protocols Employing Asymmetric Pairings -- The Role of $\Psi$ Revisited},
    howpublished = {Cryptology ePrint Archive, Report 2009/480},
    year = {2009},
    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.