competition-custom-protocol-replay

1# Competition Custom Protocol Replay
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3Use 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.
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5Use 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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7Reply in Simplified Chinese unless the user explicitly requests English.
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9## Quick Start
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111. Identify client and server roles, session boundaries, and reset conditions before decoding field semantics.
122. Recover framing, lengths, delimiters, sequence numbers, checksums, nonces, and state transitions before broad replay attempts.
133. Keep one canonical transcript of a successful exchange.
144. Change one field or one message at a time while replaying.
155. Reproduce the smallest accepted conversation that proves the decisive branch.
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17## Workflow
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19### 1. Map The Session State Machine
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21- Identify handshake, negotiation, authentication, keepalive, command, and teardown phases.
22- Record which fields are static, which are derived, and which depend on prior messages.
23- Keep message order, direction, and timing tied to the same session identity.
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25### 2. Recover Framing And Integrity
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27- Reconstruct lengths, delimiters, type bytes, checksums, MACs, counters, compression, or encryption boundaries.
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