@misc{cryptoeprint:2006:402,
    author = {Nicolas T. Courtois and Gregory V. Bard},
    title = {Algebraic Cryptanalysis of the Data Encryption Standard},
    howpublished = {Cryptology ePrint Archive, Report 2006/402},
    year = {2006},
    url = {http://eprint.iacr.org/2006/402},
}