Cryptology ePrint Archive: BibTeX Citation of Report 2013/227

@misc{cryptoeprint:2013:227,
    author = {Chunyu Tang and David A. Naumann and Susanne Wetzel},
    title = {Analysis of authentication and key establishment in inter-generational mobile telephony},
    howpublished = {Cryptology ePrint Archive, Report 2013/227},
    year = {2013},
    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.