Cryptology ePrint Archive: BibTeX Citation of Report 2010/409

@misc{cryptoeprint:2010:409,
    author = {Jooyoung Lee and Martijn Stam and John Steinberger},
    title = {The collision security of Tandem-DM in the ideal cipher model},
    howpublished = {Cryptology ePrint Archive, Report 2010/409},
    year = {2010},
    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.