Cryptology ePrint Archive: BibTeX Citation of Report 2005/047

@misc{cryptoeprint:2005:047,
    author = {Qiang Tang and Chris J. Mitchell},
    title = {Cryptanalysis of an anonymous wireless authentication and conference key distribution scheme},
    howpublished = {Cryptology ePrint Archive, Report 2005/047},
    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.