Cryptology ePrint Archive: BibTeX Citation of Report 2004/152

@misc{cryptoeprint:2004:152,
    author = {Neal Koblitz and Alfred Menezes},
    title = {Another Look at ``Provable Security''},
    howpublished = {Cryptology ePrint Archive, Report 2004/152},
    year = {2004},
    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.