@misc{cryptoeprint:2009:627,
    author = {Yiyuan Luo and Zhongming Wu and Xuejia Lai},
    title = {Unified Impossible Differential Cryptanalysis on Block Cipher Structures},
    howpublished = {Cryptology ePrint Archive, Report 2009/627},
    year = {2009},
    url = {http://eprint.iacr.org/2009/627},
}