Cryptology ePrint Archive: BibTeX Citation of Report 2009/210

@misc{cryptoeprint:2009:210,
    author = {Guido Bertoni and Joan Daemen and Michael Peeters and Gilles Van Assche},
    title = {Sufficient conditions for sound tree and sequential hashing modes},
    howpublished = {Cryptology ePrint Archive, Report 2009/210},
    year = {2009},
    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.