@misc{cryptoeprint:2012:663,
    author = {Alexander Rostovtsev},
    title = {Virtual isomorphisms of ciphers: is AES secure against differential / linear attack?},
    howpublished = {Cryptology ePrint Archive, Report 2012/663},
    year = {2012},
    url = {http://eprint.iacr.org/2012/663},
}