Individual skill
pentest-ctf-crypto
Cryptography tools for solving CTF challenges involving ciphers, hashing, and weak encryption.
skills/pentest-ctf-crypto/SKILL.md
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- Instructions only
- Last checked
- Nov 6, 2026
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- Repository last updated
- Oct 20, 2026
- License
- Apache-2.0
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# Pentest CTF Crypto
## Purpose
Analyze and break cryptographic implementations, including classical ciphers, RSA weak keys, and hash extensions.
## Core Workflow
1. **Cipher Identification**: Identify the type of encryption or encoding used (e.g., Base64, Caesar, RSA).
2. **Classical Cracking**: Brute-force or analyze frequency for classical ciphers using `ciphey` or online tools.
3. **RSA Attacks**: Check for common RSA weaknesses (small e, small factors) using `RsaCtfTool`.
4. **Hash Analysis**: Identify hash types and attempt cracking or length extension attacks using `hashcat` or `hashpump`.
5. **Math/Primes**: Solve mathematical problems related to cryptography using `sagemath`.
## References
- `references/tools.md`