@misc{cryptoeprint:2009:117,
    author = {Alexander Rostovtsev},
    title = {Changing probabilities of differentials and linear sums via isomorphisms of ciphers},
    howpublished = {Cryptology ePrint Archive, Report 2009/117},
    year = {2009},
    url = {http://eprint.iacr.org/2009/117},
}