Cryptology ePrint Archive: BibTeX Citation of Report 2012/181

@misc{cryptoeprint:2012:181,
    author = {Nils Fleischhacker and Mark Manulis and Amir Azodi},
    title = {A Modular Framework for Multi-Factor Authentication and Key Exchange},
    howpublished = {Cryptology ePrint Archive, Report 2012/181},
    year = {2012},
    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.