@misc{cryptoeprint:2008:340,
    author = {Yasufumi Hashimoto and Kouichi Sakurai},
    title = {On construction of signature schemes based on birational permutations over noncommutative rings},
    howpublished = {Cryptology ePrint Archive, Report 2008/340},
    year = {2008},
    url = {http://eprint.iacr.org/2008/340},
}