@misc{cryptoeprint:2012:233,
    author = {Qi Chai and Guang Gong},
    title = {A Cryptanalysis of HummingBird-2: The Differential Sequence Analysis},
    howpublished = {Cryptology ePrint Archive, Report 2012/233},
    year = {2012},
    url = {http://eprint.iacr.org/2012/233},
}