ctf-crypto

Identify cryptographic algorithms and vulnerabilities in binary programs for CTF competitions.

2|Updated Feb 10, 2026

Search Tags:#encryption #ctf #reverse engineering #binary analysis #cryptanalysis

Ready to run

npx skills add https://github.com/258369123/CTFAgent --skill ctf-crypto-258369123

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: ctf-crypto
Source: https://github.com/258369123/CTFAgent/tree/main/.agents/skills/ctf-crypto
Command: npx skills add https://github.com/258369123/CTFAgent --skill ctf-crypto-258369123

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires Ghidra, python, yaml, and includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill provides comprehensive analysis tools and methodologies to tackle cryptography challenges in Capture The Flag (CTF) competitions.

Core Features & Use Cases

Algorithm Identification: Quickly identify and classify encryption algorithms used in CTF challenges.
Weakness Detection: Identify potential vulnerabilities and weaknesses in cryptographic implementations.
Key Extraction: Locate and extract cryptographic keys from binary programs.
Use Case: Imagine you're given a binary executable with a hidden flag protected by encryption. Use this Skill to analyze the binary, identify the encryption algorithm, find potential weaknesses, extract the key, and retrieve the flag.

Quick Start

Run the 'analyze-crypto' script on the binary executable 'challenge-binary.bin' to get started.

Frequently Asked Questions about ctf-crypto

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I identify cryptographic algorithms in a binary executable for a CTF challenge?▼

You can identify cryptographic algorithms in a binary executable by running the analyze-crypto script to detect encryption patterns and classify the mechanisms used. This reveals implementation flaws and pinpoints specific cryptographic structures within the program.

What is the best way to extract encryption keys from binary programs during cryptanalysis?▼

The best way to extract encryption keys from binary programs is to perform reverse engineering using Ghidra to locate embedded key material. This approach enables you to retrieve hidden flags protected by encryption algorithms.

Do I need Ghidra to analyze executable files for cryptographic vulnerabilities?▼

Yes, you need Ghidra to analyze executable files for cryptographic vulnerabilities because it provides the reverse engineering capabilities required. This Skill depends on binary analysis tools like Ghidra, Python, and YAML to identify implementation flaws.

How does weakness detection in cryptographic implementations work for CTF competitions?▼

Weakness detection in cryptographic implementations works by analyzing executable files to identify potential vulnerabilities and implementation flaws in the encryption logic. This exposes decryption capabilities and weaknesses that can be exploited to retrieve hidden flags.

Can I use Python scripts to automate decryption and cryptanalysis tasks on challenge binaries?▼

Yes, you can use Python scripts to automate decryption and cryptanalysis tasks on challenge binaries. The Skill includes scripts and references that leverage Python to process executable files, identify encryption algorithms, and retrieve protected flags.