@misc{cryptoeprint:2005:202,
    author = {Nicolas Courtois},
    title = {The Best Differential Characteristics and Subtleties of the Biham-Shamir Attacks on DES},
    howpublished = {Cryptology ePrint Archive, Report 2005/202},
    year = {2005},
    url = {http://eprint.iacr.org/2005/202},
}