protocol-reverse-engineering

You can reverse-engineer unknown protocols by capturing traffic with tools like Wireshark or tcpdump, then analyzing the binary messages to identify field structures, state machines, and encryption clues for custom dissection.

Yes, you can build a Wireshark dissector for custom binary protocols by mapping the message flow and header fields from captured traffic. This allows you to inspect live sessions and parse proprietary TCP/UDP services directly within Wireshark.

Binary message dissection on TCP and UDP streams works by reconstructing the captured packets into a continuous flow, then applying structural analysis to identify field boundaries, signatures, and state transitions within the undocumented binary payloads.

TLS inspection is required to analyze encrypted traffic in packet captures. By decrypting the intercepted traffic, you can perform binary message dissection and map the underlying proprietary protocol structures hidden within the secure layer.

The best way to identify message structures and signatures in network traffic is to capture live sessions using tshark or mitmproxy, then systematically isolate payloads to map state machines and document the custom protocol formats.

Yes, you can use packet captures to create fuzzing targets for unknown protocols. By reverse-engineering the binary message formats and state machines, you can generate structured inputs to test proprietary TCP and UDP services for vulnerabilities.