A Survey and Analysis of Media Keying Techniques in Session Initiation Protocol (SIP)?

In this paper we are presenting a survey about the key exchange protocols namely ZRTP, DTLSSRTP, SDES[4] and MSDES[15]. The SIP is used for signaling in VOIP which is completely text based application layer protocol hence there is a lot of security issues and challenges associated with VOIP. A detailed analysis of key exchange protocols and its suitability with SIP has been carried out in this paper. In VOIP we require security at both signaling and data transfer levels and signaling is text based so confidentiality of signaling parameters and data is a big challenge in VOIP. Even exchanging cryptographic keys to encrypt the media stream in the SIP is difficult task. There is a need for stronger key management protocols which will secure the voice data from various types of attack and which also provides a feasible key exchange mechanism.