@misc{cryptoeprint:2013:222,
    author = {Shan Chen, John Steinberger},
    title = {Tight security bounds for key-alternating ciphers},
    howpublished = {Cryptology ePrint Archive, Report 2013/222},
    year = {2013},
    url = {http://eprint.iacr.org/2013/222},
}