@misc{cryptoeprint:2005:240,
    author = {Fangguo Zhang and Xiaofeng Chen},
    title = {Attack on Okamoto  et al.'s New Short Signature Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2005/240},
    year = {2005},
    url = {http://eprint.iacr.org/2005/240},
}