@misc{cryptoeprint:2009:495,
    author = {Qingfeng Cheng and Chuangui Ma},
    title = {Security Weakness in Two Authenticated Key Exchange Protocols},
    howpublished = {Cryptology ePrint Archive, Report 2009/495},
    year = {2009},
    url = {http://eprint.iacr.org/2009/495},
}