Jaafar, Mohd Yazid Mohd
(2013)
Enhancing Security Protocol For Voip Communication Using Modified Vector Quantization.
Masters thesis, Universiti Sains Malaysia.
Abstract
VoIP has introduced a new set of challenge that practically unheard off when a landline
phone was used. Session Initiation Protocol (SIP) is often used as the main signaling
protocol in VoIP. However, the lack of security feature has exposed SIP to a number
of network threats. Public Key Infrastructure (PKI) is widely used to provide the
authentication layer, but incurs maintenance cost. Verbal authentication is a security
protocol specifically developed for VoIP. Unfortunately, user needs to manually perform
the authentication steps over the phone. This study proposed a security protocol
for video call in VoIP that does not relies on PKI. It uses image metric to secure the
public key. The protocol is a certificate-less and uses human intelligence in authenticating
the caller. User does not need to speak and compare the authentication code
manually. Modified Vector Quantization (MVQ) and Image Metric Generation Function
(IGF) are also introduced to help increase the reliability of the security protocol
against network issues. The experimental results have demonstrated that the proposed
protocol is robust, reliable and practical for video call in VoIP communication. The
security analysis also has proved that the proposed protocol can resist known attacks
against VoIP communication.
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