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competition-custom-protocol-replay

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Internal downstream skill for ctf-sandbox-orchestrator. CTF-sandbox workflow for custom binary or text protocol recovery, handshake reconstruction, framing, sequence control, checksums, stateful replay, and accepted-session reproduction. Use when the user asks to decode an unknown protocol, recover custom framing, build a replay harness, satisfy sequence or checksum rules, replay a captured session, or prove the smallest message order that reaches an accepted branch. Use only after `$ctf-sandbox-orchestrator` has already established sandbox assumptions and routed here.

CTF-Sandbox-Orchestrator/competition-custom-protocol-replay/SKILL.md

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Yes
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Observed behavior
Network or broad shell
Last checked
Nov 9, 2026

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44,511
Repository last updated
Sep 22, 2026
License
MIT

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# Competition Custom Protocol Replay

Use this skill only as a downstream specialization after `$ctf-sandbox-orchestrator` is already active and has established sandbox assumptions, node ownership, and evidence priorities. If that has not happened yet, return to `$ctf-sandbox-orchestrator` first.

Use this skill when the hard part is not merely naming the protocol, but reproducing the exact message order and state needed for acceptance.

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## Quick Start

1. Identify client and server roles, session boundaries, and reset conditions before decoding field semantics.
2. Recover framing, lengths, delimiters, sequence numbers, checksums, nonces, and state transitions before broad replay attempts.
3. Keep one canonical transcript of a successful exchange.
4. Change one field or one message at a time while replaying.
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