Cryptology ePrint Archive: BibTeX Citation of Report 2006/105

@misc{cryptoeprint:2006:105,
    author = {Vlastimil Klima},
    title = {Tunnels in Hash Functions: MD5 Collisions Within a Minute},
    howpublished = {Cryptology ePrint Archive, Report 2006/105},
    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.