@misc{cryptoeprint:2007:220,
    author = {Fengjiao WANG and Yuqing ZHANG},
    title = {A New Provably Secure Authentication and Key Agreement Mechanism for SIP Using Certificateless Public-key Cryptography},
    howpublished = {Cryptology ePrint Archive, Report 2007/220},
    year = {2007},
    url = {http://eprint.iacr.org/2007/220},
}