@misc{cryptoeprint:2009:137,
    author = {Nicolas T. Courtois},
    title = {The Dark Side of Security by Obscurity and Cloning MiFare Classic Rail and Building Passes Anywhere, Anytime},
    howpublished = {Cryptology ePrint Archive, Report 2009/137},
    year = {2009},
    url = {http://eprint.iacr.org/2009/137},
}