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The secure vulnerabilities of network protocols are likely exploited by malicious users to cause damage even disaster. In the paper, the authors proposed an approach to analyze, model and verify the network protocols using the process algebra CSP. First, extract the basic grammar, semantics and rules by analyzing the network protocol. Model the basic logic structure of the protocol, potential intruders in real environment and security constraints of the protocol as CSP processes; then use model checking techniques to verify the model and find out the vulnerabilities of protocol. With this method they modeled and verified Border Gateway Protocol (BGP).
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