Cryptology ePrint Archive: BibTeX Citation of Report 2005/269

@misc{cryptoeprint:2005:269,
    author = {Junghyun Nam, Seungjoo Kim, and Dongho Won},
    title = {Security Weakness in a Three-Party Password-Based Key Exchange Protocol Using Weil Pairing},
    howpublished = {Cryptology ePrint Archive, Report 2005/269},
    year = {2005},
    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.