Application-level protocol analyzers are important components in tools such as intrusion detection systems, firewalls, and network monitors. Currently, protocol analyzers are written in an ad-hoc fashion using low-level languages such as C, incurring a high development cost and security risks inherent in low-level language programming. Motivated by the large number of application-level protocols and new ones constantly emerging, it has architected and prototyped a Generic Application-level Protocol Analyzer (GAPA), consisting of a protocol specification Language (GAPAL) and an analysis engine that operates on network streams and traces. GAPA allows rapid creation of protocol analyzers, greatly reducing the development time needed.
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