@misc{cryptoeprint:2007:219,
    author = {Liufei Wu1, 2, Yuqing Zhang1, Fengjiao Wang1},
    title = {A New Provably Secure Authentication and Key Agreement Protocol for SIP Using ECC},
    howpublished = {Cryptology ePrint Archive, Report 2007/219},
    year = {2007},
    url = {http://eprint.iacr.org/2007/219},
}