New: 98,000+ skills indexed from GitHub repos with 100+ stars · every skill safety-checkedBrowse top skillsTop skills
Esc to closeBrowse all skills
Submit a skillBrowse skills
Submit a skillBrowse skills

Agent skill

Kctf Algebraic Crackme Chain

by manyuegong33 in manyuegong33/r0crawl_skills

Solve KCTF Windows crackmes with layered codecs, 32/64-bit shell thunks, .data-resident code, and final algebraic or polynomial checks.

No licenceAuto-check passed

Install Kctf Algebraic Crackme Chain

skills CLI
$ npx skills add manyuegong33/r0crawl_skills --skill kctf-algebraic-crackme-chain -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install manyuegong33/r0crawl_skills kctf-algebraic-crackme-chain --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/manyuegong33/r0crawl_skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/kctf-algebraic-crackme-chain .claude/skills/kctf-algebraic-crackme-chain && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
kctf-algebraic-crackme-chain
GitHub stars
312
Token cost
~467 tokens
SKILL.md length
224 words
Files
3 (incl. references)
Skills in repo
9
Repo updated
First seen
Licence
None found

At a glance

Solve KCTF Windows crackmes with layered codecs, 32/64-bit shell thunks, .data-resident code, and final algebraic or polynomial checks.

  • Works in 6 steps: Inventory the PE, entrypoint, sections,… → Separate shell code from real logic. If… → Identify each layer → …
  • A PE/EXE has name+serial prompts
  • SKILL.md covers Use this skill, Workflow, KCTF 4-style pattern and Practical checks, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Kctf Algebraic Crackme Chain is an agent skill from manyuegong33/r0crawl_skills. Solve KCTF Windows crackmes with layered codecs, 32/64-bit shell thunks, .data-resident code, and final algebraic or polynomial checks. Use when a PE/EXE has name+serial prompts, huge staged serials, lookup-table mixers, or root-finding gates.

Its SKILL.md is about 470 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `agents/openai.yaml` and `references/pattern.md`).

The repository describes itself as: r0crawlskills is a massive reverse-engineering skill arsenal for web, Android, iOS, Frida, native binaries, protocols, malware, firmware, and anti-analysis—built for beginners…

When your agent uses it

  • A PE/EXE has name+serial prompts
  • Huge staged serials
  • Lookup-table mixers
  • Root-finding gates

Example prompts

  • “/kctf-algebraic-crackme-chain”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Inventory the PE, entrypoint, sections, imports, prompt strings, and output strings.
  2. Separate shell code from real logic. If code lives in .data, treat it as executable.
  3. Identify each layer
  4. Validate each layer on
  5. Keep three artifacts distinct
  6. Save the replay command plus the smallest dump needed to reproduce the result.

What it can do on your machine

Read from SKILL.md and the folder at commit b9eb545. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Kctf Algebraic Crackme Chain loads about 467 tokens when it runs, and up to ~893 if it reads all its reference files. Until then it costs about 68 tokens; SKILL.md has 224 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~68
When it runs · the whole SKILL.md, loaded when a task matches
~467
With references · SKILL.md plus every file in references/, read only if the agent opens them
~893

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 224 words (~467 tokens).

“Use this for KCTF-style Windows crackmes where the visible checker is only a shell and the real logic is split across:”

— opening of SKILL.md by manyuegong33
name
kctf-algebraic-crackme-chain

Read the full SKILL.md on GitHub

Files

SKILL.md and 2 other files (references) in skills/kctf-algebraic-crackme-chain of manyuegong33/r0crawl_skills.

  • SKILL.md
  • agents/openai.yaml
  • references/pattern.md

Open the folder on GitHubat commit b9eb545

Compare with similar skills

Kctf Algebraic Crackme Chain next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Kctf Algebraic Crackme Chain compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Kctf Algebraic Crackme Chain this skillmanyuegong33/r0crawl_skills312—~467Automated safety check: PassNone
Windows Desktop E2Eaffaan-m/ECC277k1 repos~7.6kAutomated safety check: PassMIT
Windows Desktop E2Eaffaan-m/ECC276k—~5.5kAutomated safety check: PassMIT
Cascade Layersthedaviddias/Front-End-Checklist74k—~514Automated safety check: PassMIT
Windows Hardeningsickn33/agentic-awesome-skills47k2 repos~4.4kAutomated safety check: PassMIT
Windows Serversickn33/agentic-awesome-skills47k2 repos~2.9kAutomated safety check: PassMIT

Similar skills

  • Windows Desktop E2E

    affaan-m/ECC

    E2E testing for Windows native desktop apps (WPF, WinForms, Win32/MFC, Qt) using pywinauto and Windows UI Automation.

    277k GitHub starsUsed in 1 repo~7.6k tokens
    Testing & QAAuto-check passed

  • Windows Desktop E2E

    affaan-m/ECC

    E2E testing for Windows native desktop apps (WPF, WinForms, Win32/MFC, Qt) using pywinauto and Windows UI Automation.

    276k GitHub stars~5.5k tokensUpdated yesterday
    Testing & QAAuto-check passed

  • Cascade Layers

    thedaviddias/Front-End-Checklist

    A skill your agent uses when reviewing a CSS architecture for specificity issues, setting up a design system, or migrating a large codebase from utility-first to a layered architecture.

    74k GitHub stars~514 tokensUpdated 5 days ago
    Frontend & DesignAuto-check passed

  • Windows Hardening

    sickn33/agentic-awesome-skills

    Harden Windows servers per security baselines and CIS benchmarks.

    47k GitHub starsUsed in 2 repos~4.4k tokens
    Auto-check passed

  • Windows Server

    sickn33/agentic-awesome-skills

    Administer Windows Server systems. An agent skill from sickn33/agentic-awesome-skills.

    47k GitHub starsUsed in 2 repos~2.9k tokens
    SecurityAuto-check passed

  • Layered Design

    sickn33/agentic-awesome-skills

    Web and App implementation guide for Layered Design. An agent skill from sickn33/agentic-awesome-skills.

    47k GitHub starsUsed in 1 repo~2.2k tokens
    MobileAuto-check passed

More from manyuegong33/r0crawl_skills

All 9 skills in this repo

  • Ctf Key Recovery

    manyuegong33/r0crawl_skills

    Reconstruct CTF key, serial, and flag verifiers using known plaintext, repeating XOR, encoded constants, bytecode replacement, hash constraints, SMT, and bounded brute force.

    312 GitHub stars~434 tokensUpdated 21 days ago
    Auto-check passed

  • Kctf ML Backdoor Linear

    manyuegong33/r0crawl_skills

    Solve KCTF model backdoors and small linear/ReLU crackmes from raw weights.

    312 GitHub stars~443 tokensUpdated 21 days ago
    Auto-check passed

  • Cpython Runtime Introspection

    manyuegong33/r0crawl_skills

    Inspect embedded or packaged CPython processes at runtime by tracing child processes, acquiring the GIL, injecting Python, replacing builtins.input, walking frame.fback, exporting frame code…

    312 GitHub stars~537 tokensUpdated 21 days ago
    Auto-check passed

  • Python Frozen App Reversing

    manyuegong33/r0crawl_skills

    Recover logic from PyInstaller, cxFreeze, py2exe, Nuitka, and other frozen Python applications, including modified bootloaders, decoy entry scripts, patched frozen standard-library modules, embedded…

    312 GitHub stars~666 tokensUpdated 21 days ago
    Auto-check passed

  • R0crawl Skills

    manyuegong33/r0crawl_skills

    面向新手的全谱系逆向工程路由器，覆盖 Web/JavaScript、Android/iOS、Frida、脱壳、反分析、原生二进制、协议、固件、恶意软件、游戏、云 API、CTF、可复现一致性测试。用于逆向、起步、脱壳、反编译、hook、Frida、绕过检测、APK/SO/DEX/JS/PCAP/WASM/PE/ELF/Mach-O 分析、签名还原，或从样本到验证结果的完整调查。

    312 GitHub stars~1.2k tokensUpdated 21 days ago
    Auto-check passed

  • Kctf Windows Smc Chain

    manyuegong33/r0crawl_skills

    KCTF 2026 第八题“亥子合辰·塔影迷楼”两级 SMC、反调试、Feistel 与 GF(2^127-39) 多项式求根的可复用解题流程。

    312 GitHub stars~467 tokensUpdated 21 days ago
    Auto-check passed

Questions about Kctf Algebraic Crackme Chain

What does Kctf Algebraic Crackme Chain do?

Solve KCTF Windows crackmes with layered codecs, 32/64-bit shell thunks, .data-resident code, and final algebraic or polynomial checks. Kctf Algebraic Crackme Chain is an agent skill from manyuegong33/r0crawl_skills.data-resident code, and final algebraic or polynomial checks.

When should I use Kctf Algebraic Crackme Chain?

Kctf Algebraic Crackme Chain fits situations like: A PE/EXE has name+serial prompts; huge staged serials; lookup-table mixers; root-finding gates.

How do I install Kctf Algebraic Crackme Chain in Claude Code?

Run `npx skills add manyuegong33/r0crawl_skills --skill kctf-algebraic-crackme-chain -a claude-code`. Or copy the skill folder (skills/kctf-algebraic-crackme-chain in manyuegong33/r0crawl_skills) into .claude/skills/kctf-algebraic-crackme-chain in your project. Claude Code loads it when a task matches its description.

How do I install Kctf Algebraic Crackme Chain in Codex?

Run `npx skills add manyuegong33/r0crawl_skills --skill kctf-algebraic-crackme-chain -a codex`. Or copy the skill folder (skills/kctf-algebraic-crackme-chain in manyuegong33/r0crawl_skills) into .agents/skills/kctf-algebraic-crackme-chain in your project. Codex loads it when a task matches its description.

Can I use Kctf Algebraic Crackme Chain in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add manyuegong33/r0crawl_skills --skill kctf-algebraic-crackme-chain -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/kctf-algebraic-crackme-chain, .gemini/skills/kctf-algebraic-crackme-chain, .github/skills/kctf-algebraic-crackme-chain and .opencode/skills/kctf-algebraic-crackme-chain in your project.

What does Kctf Algebraic Crackme Chain need to run?

SKILL.md names no scripts, command-line tools or credentials: Kctf Algebraic Crackme Chain is instructions for the agent only.

Does Kctf Algebraic Crackme Chain access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Kctf Algebraic Crackme Chain safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Kctf Algebraic Crackme Chain use?

No licence was found for Kctf Algebraic Crackme Chain or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Kctf Algebraic Crackme Chain use?

About 467 tokens (SKILL.md is roughly 1.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 426 tokens, read only when the agent opens those files.

What are the alternatives to Kctf Algebraic Crackme Chain?

Skills that share tags, products or a category with Kctf Algebraic Crackme Chain: Windows Desktop E2E (affaan-m/ECC, 277k stars), Windows Desktop E2E (affaan-m/ECC, 276k stars), Cascade Layers (thedaviddias/Front-End-Checklist, 74k stars) and Windows Hardening (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Kctf Algebraic Crackme Chain?

manyuegong33 (a GitHub user) maintains it in manyuegong33/r0crawl_skills, which has 312 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on September 20, 2026.

Source: manyuegong33/r0crawl_skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.