@misc{cryptoeprint:2002:152,
    author = {Jorge Nakahara Jr and Bart Preneel and Joos Vandewalle},
    title = {A note on Weak Keys of PES, IDEA and some Extended Variants},
    howpublished = {Cryptology ePrint Archive, Report 2002/152},
    year = {2002},
    url = {http://eprint.iacr.org/2002/152},
}