@misc{cryptoeprint:2009:245,
    author = {Naoki Ogura and Shigenori Uchiyama},
    title = {Cryptanalysis of the Birational Permutation Signature Scheme over a Non-commutative Ring},
    howpublished = {Cryptology ePrint Archive, Report 2009/245},
    year = {2009},
    url = {http://eprint.iacr.org/2009/245},
}