@misc{cryptoeprint:2009:338,
    author = {*Jue-Sam Chou1, Chun-Hui Huang2, Cheng-Chung Ding3},
    title = {Security weaknesses in two multi-server password based authentication protocols},
    howpublished = {Cryptology ePrint Archive, Report 2009/338},
    year = {2009},
    url = {http://eprint.iacr.org/2009/338},
}