Cryptology ePrint Archive: BibTeX Citation of Report 2009/291

@misc{cryptoeprint:2009:291,
    author = {M. Choudary Gorantla and Colin Boyd and Juan Manuel Gonz\'alez Nieto},
    title = {Modeling Key Compromise Impersonation Attacks on Group Key Exchange Protocols},
    howpublished = {Cryptology ePrint Archive, Report 2009/291},
    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.