Solve Windows KCTF crackmes with chained checks, RSA gates, lookup tables, SMC loaders, anti-debug, and Feistel-style math. Use when the artifact is a Windows EXE with Key/verify prompts, layered validation, or self-modifying code.
Installs into .claude/skills of the current project.
Are you the author of Kctf Windows Crackme Chain?
Add the live security badge to your README. It updates with every re-scan.
[](https://www.skillsdirectory.com/skills/manyuegong33-kctf-windows-crackme-chain)
---
name: kctf-windows-crackme-chain
description: Solve Windows KCTF crackmes with chained checks, RSA gates, lookup tables, SMC loaders, anti-debug, and Feistel-style math. Use when the artifact is a Windows EXE with Key/verify prompts, layered validation, or self-modifying code.
---
# Kctf Windows Crackme Chain
## Workflow
1. Classify the file: PE/EXE, packed EXE, SMC loader, or plain crackme.
2. Identify the gate chain:
- serial / checksum / RSA / lookup
- self-modifying stages
- anti-debug / anti-breakpoint
- Feistel / finite-field / polynomial gates
3. Strip the fake path first; recover the real checker or decrypted code.
4. Separate independent gates and solve the cheapest one first.
5. Verify with a replay input before trusting the algebra.
6. Keep the final key/serial reproducible as a command line, not just a pasted value.
## References
- `references/corpus-map.md` for case routing.
- Combine with `kctf-ml-backdoor-linear` when the challenge is a model/backdoor puzzle.
