@misc{cryptoeprint:2011:247,
    author = {Qi Chai, Xinxin Fan, Guang Gong},
    title = {An Ultra-Efficient Key Recovery Attack on the Lightweight Stream Cipher A2U2},
    howpublished = {Cryptology ePrint Archive, Report 2011/247},
    year = {2011},
    url = {http://eprint.iacr.org/2011/247},
}