Cryptology ePrint Archive: BibTeX Citation of Report 2006/369

@misc{cryptoeprint:2006:369,
    author = {Guido Bertoni and Joan Daemen and Micha\"el Peeters and Gilles Van Assche},
    title = {RadioGat\'un, a belt-and-mill hash function},
    howpublished = {Cryptology ePrint Archive, Report 2006/369},
    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.