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The Research of Authentication Mechanismsins in H.323 Network

Author: JianZuoZuo
Tutor: GuoShiZe
School: Beijing University of Posts and Telecommunications
Course: Information Security
Keywords: VoIP H.323 Security authentication S/KEY trust management
CLC: TP393.08
Type: Master's thesis
Year: 2012
Downloads: 37
Quote: 0
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Abstract


With the merging of traditional telecom network and computer network,VoIP emerged, which can transmit voice data by packet switching technology instead of traditional circuit switching technology.It is also called IP telephone. People are paying more and more attention to VoIP, for its conveniency and high efficiency. However VoIP is not absolutely security, which is vulnerable to eavesdrop, falsification and Dos attacks. Therefore security of VoIP is one of the most important questions which the use and network operators are concerned with. H.323 is the mainstream protocol of VoIP.The research of security authentication mechanisms in H.323 network, is very significant to the security of VoIP network in operation level.Based on the study on H.323 protocol and related authentication theory, and principle of using practice to test theory, against the security authentication mechanisms in H.323 network, detail work in this paper are as follows:(1) Found the vulnerability cased by the insecure authentication mechanismin in H.323 network, by analysing and researching on H.323 protocol and authentication mechanisms. And related experiment had proved those vulnerability, if not made up, can be made use of by attackers.(2) Introduced the improved dynamic password authentication protocol--S/KEY into H.323 network,described H.323 network authentication mechanisms based on S/KEY from H.323 system components perspective, realized the mutual authentication during registration, call initialization,and call termination process.(3) Introduced authentication credibility into H.323 network, and designed trust management model of H.323 network.So the authentication mechanisms can be altered dynamically according to the credibility of the terminal node, which adapt to the large amount of traffic and rapid exchange in practical operation.(4) Implemented the H.323 network components, simulated the H.323 network communication system that integrates the above authentication mechanisms, and proved its feasibility and security by secutity test experiments that implemented in (1).

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