Cryptology ePrint Archive: BibTeX Citation of Report 2006/320

@misc{cryptoeprint:2006:320,
    author = {Johannes Buchmann and Luis Carlos Coronado Garcia and Erik Dahmen and Martin Doering and Elena Klintsevich},
    title = {CMSS -- An Improved Merkle Signature Scheme},
    howpublished = {Cryptology ePrint Archive, Report 2006/320},
    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.