@misc{cryptoeprint:2011:638,
    author = {Christophe Petit and Jean-Jacques Quisquater},
    title = {Rubik's for cryptographers},
    howpublished = {Cryptology ePrint Archive, Report 2011/638},
    year = {2011},
    url = {http://eprint.iacr.org/2011/638},
}