An Efficient SIP Authentication Scheme for Multiserver Infrastructure

Session Initiation Protocol (SIP) is used between user and server to generate and agree upon a new session key through authentication mechanism. Many single server SIP authentication schemes have been proposed, but we need multiserver scheme to make it more realistic and feasible for implementation. It was found that some schemes work only for single server model and are not possible to scale up for multiserver environment. While some models support multiserver architecture but are vulnerable to known attacks. In this paper, we propose a new authentication scheme for SIP which can support multiserver environment. Security evaluation was done against various known attacks to check strength of the proposed scheme. Various functionalities like mutual authentication and user anonymity is also supported by the newly proposed scheme. Further our model is relatively more efficient as we establish connection only by using hash functions which are lightweight operations.