@misc{cryptoeprint:2012:668,
    author = {Gaetan Leurent},
    title = {Construction of Differential Characteristics in ARX Designs -- Application to Skein},
    howpublished = {Cryptology ePrint Archive, Report 2012/668},
    year = {2012},
    url = {http://eprint.iacr.org/2012/668},
}