| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 95 === In the recent years, VoIP is a popular application as VoIP related techniques matured. It will face with the danger of network security since VoIP is voice communication based on IP network. Therefore, many network device manufacturer begin to work together with security experts for providing more secure and reliable voice communication application. VoIP mainly adopted H.323 or SIP protocol. H.323 is an earlier technique, whose frame is too multifarious and without scalability for VoIP.
Our research is to establish secure SIP-based VoIP environment, we integrate various SIP-based soft phone in Ethernet and Wireless Local Area network (WLAN) for real-time voice applications. To keep user not to feel degraded on the Quality of Service (QoS) and suffer security problems in session mobility, so our system can achieve transitive trust.
We use MIKEY protocol to achieve secure SRTP master key exchange, and then use session key derived from master key to protect real-time voice communication from eavesdropping or attack. Under definition of invite processing delay, invite response delay and session mobility time delay, we compare the effects in the different key exchange mechanism, such as pre-shared key exchange management or Diffie-Hellman(D-H) key exchange management based on the certificate.
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