@misc{cryptoeprint:2011:216,
    author = {Shaohua Tang and Jintai Ding and Zhiming Yang},
    title = {Secure Group Key Management Approach Based upon N-dimensional Hyper-sphere},
    howpublished = {Cryptology ePrint Archive, Report 2011/216},
    year = {2011},
    url = {http://eprint.iacr.org/2011/216},
}