Competition Stego Media

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 challenge lives inside a media container, hidden channel, or appended payload rather than a conventional crypto blob.

Reply in Simplified Chinese unless the user explicitly requests English.

Quick Start

1. Confirm the real container type, dimensions, duration, codec, and chunk layout before guessing a hidden layer.
2. Check metadata, thumbnails, sidecar files, and appended trailers before deeper signal-domain work.
3. Rank candidate channels by evidence: alpha, palette, LSB, transform-domain residue, frame order, or container slack.
4. Preserve each extracted layer separately so the transform chain stays reproducible.
5. Stop when the hidden payload is reproduced, not merely suspected.

Workflow

1. Establish Container Truth