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competition-zip-archive

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Internal downstream skill for ctf-sandbox-orchestrator. CTF-sandbox workflow for ZIP and PKZIP archive challenges, legacy ZipCrypto identification, known-plaintext recovery with bkcrack, key-based decryption, and reproducible extraction. Use when the user asks to solve an encrypted ZIP challenge, inspect ZipCrypto metadata, recover keys from a known file prefix, or unlock an archive without starting with password brute force. Use only after `$ctf-sandbox-orchestrator` has already established sandbox assumptions and routed here.

CTF-Sandbox-Orchestrator/competition-zip-archive/SKILL.md

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

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44,410
Repository last updated
Sep 22, 2026
License
MIT

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# Competition ZIP Archive

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

Use this skill when the decisive path is an encrypted ZIP/PKZIP archive rather than an upload parser or a generic crypto blob. Prefer the legacy ZipCrypto known-plaintext path when the challenge gives a predictable file, format header, template, or other recoverable plaintext. Do not begin with blind password brute force.

Reply in Simplified Chinese unless the user explicitly requests English. Keep commands and tool output in their original form.

## Quick Start

1. Preserve the original archive, compute a hash, and work on a copy under the analysis project's `work/<case>/` directory.
2. Confirm the actual archive format and list entries before attempting a password attack.
3. Determine whether the entry uses legacy ZipCrypto. `bkcrack` does not recover WinZip AES or other modern encryption.
4. Build an exact known-plaintext candidate. The attack needs at least 12 known plaintext bytes, including at least 8 contiguous bytes.
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