Cryptology ePrint Archive: BibTeX Citation of Report 2004/251

@misc{cryptoeprint:2004:251,
    author = {Junghyun Nam, Seungjoo Kim, and Dongho Won},
    title = {Attacks on Bresson-Chevassut-Essiari-Pointcheval's Group Key Agreement Scheme for Low-Power Mobile Devices},
    howpublished = {Cryptology ePrint Archive, Report 2004/251},
    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.