@misc{cryptoeprint:2004:360,
    author = {Christopher Wolf and Bart Preneel},
    title = {Equivalent Keys in HFE, C$^*$, and variations},
    howpublished = {Cryptology ePrint Archive, Report 2004/360},
    year = {2004},
    url = {http://eprint.iacr.org/2004/360},
}