Cryptology ePrint Archive: BibTeX Citation of Report 2006/214

@misc{cryptoeprint:2006:214,
    author = {Jens-Matthias Bohli and Maria Isabel Gonzalez Vasco and Rainer Steinwandt},
    title = {Password-Authenticated Constant-Round Group Key Establishment with a Common Reference String},
    howpublished = {Cryptology ePrint Archive, Report 2006/214},
    year = {2006},
    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.