New VoIP Traffic Security Scheme with Digital Watermarking

In this paper we propose a new, lightweight, no bandwidth consuming authentication and integrity scheme for VoIP service based on SIP as a signalling protocol. It is shared password mechanism and this solution exploits digital watermarking. Nowadays, there are many applications of this technique, such as solving copyright protection problems, but we propose to use it to secure the transmitted audio and signalling protocol that IP Telephony is based on simultaneously. This solution can be the potential answer to the problem VoIP faces today: finding a scalable and universal mechanism for securing VoIP traffic (voice and the signalling protocol messages) at the same time. It can greatly improve, if we combine it with existing security mechanisms, overall IP Telephony system's security.

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