@misc{cryptoeprint:2003:227,
    author = {Willi Geiselmann and Rainer Steinwandt},
    title = {Attacks on a Secure Group Communication Scheme With Hierarchical Access Control},
    howpublished = {Cryptology ePrint Archive, Report 2003/227},
    year = {2003},
    url = {http://eprint.iacr.org/2003/227},
}