Cryptology ePrint Archive: BibTeX Citation of Report 2007/012

@misc{cryptoeprint:2007:012,
    author = {Atefeh Mashatan  and Douglas R. Stinson},
    title = {Interactive two-channel message authentication based on interactive-collision Resistant hash functions},
    howpublished = {Cryptology ePrint Archive, Report 2007/012},
    year = {2007},
    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.