An identity-based mechanism for enhancing SIP security

Session Initiation Protocol is widely used for establishing VoIP calls in wireless packet networks. According to shortages of SIP and relevant security mechanisms, a secure identity-based mechanism was proposed in this paper. The scheme realizes point-to-point mutual authentication by employing identity-based signature, and achieves end-to-end identity authentication and key agreement between cross-domain user agents by message integrity checking and Diffle-Hellman mechanism. Compared to a trans-domain mechanism for SIP communication, our method has the advantage of more lightweight computation.