@misc{cryptoeprint:2010:201,
    author = {Yuechuan Wei and Ruilin Li and Ping Li and Chao Li },
    title = {Impossible Differential Cryptanalysis on E2},
    howpublished = {Cryptology ePrint Archive, Report 2010/201},
    year = {2010},
    url = {http://eprint.iacr.org/2010/201},
}