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Protocol reverse engineering is the process of extracting application-level specifications for network protocols. Such specifications are very helpful in a number of security-related contexts. For example, they are needed by intrusion detection systems to perform deep packet inspection, and they allow the implementation of black-box fuzzing tools. Unfortunately, manual reverse engineering is a time-consuming and tedious task. To address this problem, researchers have recently proposed systems that help to automate the process. These systems operate by analyzing traces of network traffic. However, there is limited information available at the network-level, and thus, the accuracy of the results is limited.
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