Abstract
The session initiation protocol (SIP) is a powerful and superior signaling protocol for the voice over internet protocol (VoIP). Authentication is an important security requirement for SIP. Hitherto, many authentication schemes have been proposed to enhance the security of SIP. Recently, Irshad et al. proposed an improved authentication scheme concerning SIP, in which they claimed that their scheme is secure against various security attacks. However, in this paper, we conclude that Irshad et al.'s scheme is vulnerable to user impersonation attacks. Furthermore, a novel authentication and key agreement scheme is proposed for SIP using elliptic curve cryptosystem (ECC). Security and performance analyses demonstrate that the proposed scheme is secure against security attacks of various types and has low computation cost compared to previously proposed schemes.
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