Cryptology ePrint Archive: BibTeX Citation of Report 2009/003

@misc{cryptoeprint:2009:003,
    author = {L. H. Nguyen and A. W. Roscoe},
    title = {Separating two roles of hashing in one-way message authentication},
    howpublished = {Cryptology ePrint Archive, Report 2009/003},
    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.