Cryptology ePrint Archive: BibTeX Citation of Report 2009/111

@misc{cryptoeprint:2009:111,
    author = {Marc Stevens and Alexander Sotirov and Jacob Appelbaum and Arjen Lenstra and David Molnar and Dag Arne Osvik and Benne de Weger},
    title = {Short Chosen-Prefix Collisions for MD5 and the Creation of a Rogue CA Certificate},
    howpublished = {Cryptology ePrint Archive, Report 2009/111},
    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.