Research on SIP Security Mechanism

Session Initiation Protocol (SIP) is an important protocol adopted by the 3rd Generation Partnership Project (3GPP) for the IP Multimedia Subsystem (IMS). Facing the complex and open Internet environment, the security of SIP is poor. After the analysis of the security threats to SIP aiming at cleartext transmission of SIP message and lack of authentication methods, the scheme of data encryption and authentication are researched. And then, we discuss how using the existent techniques for improving the security of SIP and propose the ideas of the security solution to SIP.