Welcome to my collection of Capture The Flag (CTF) challenge writeups! This repository documents my learning journey in cybersecurity, showcasing practical skills in penetration testing, vulnerability assessment, and ethical hacking.
I'm a Computer Science student at EPFL, passionate about cybersecurity with a focus on offensive security. Through these challenges, I'm trying to build hands-on experience while developing the analytical and technical skills essential for a cybersecurity career.
| Challenge | Difficulty | Key Skills | Date |
|---|---|---|---|
| Agent Sudo | Easy | Password cracking, Steganography | Oct 2025 |
| Brute it | Easy | Password cracking, Privilege Escalation | Sep 2025 |
| Bounty Hacker | Easy | Privilege Escalation | Sep 2025 |
| Simple CTF | Easy | SQL Injection, Privilege Escalation | Aug 2025 |
| Machine | Difficulty | Key Skills | Date |
|---|---|---|---|
| Coming Soon | - | - | - |
Repository actively updated as I complete new challenges
- Web Application Security: SQL injection, directory traversal
- Network Security: Port scanning, service enumeration, vulnerability assessment
- Privilege Escalation: Linux privilege escalation techniques
- Cryptography: Hash cracking, encoding/decoding
- Reconnaissance: Nmap, Gobuster
- Exploitation: Metasploit, Hydra, John the ripper
- Post-Exploitation: GTFOBins
Each writeup follows a consistent structure:
- Executive Summary: High-level overview of the attack chain
- Reconnaissance: Information gathering and enumeration
- Vulnerability Analysis: Identified security flaws
- Exploitation: Step-by-step attack methodology
- Privilege Escalation: Techniques used to gain elevated access
Through these challenges, I'm developing:
- Technical Proficiency: Hands-on experience with cybersecurity tools and techniques
- Analytical Thinking: Systematic approach to vulnerability assessment
- Documentation Skills: Clear technical communication for diverse audiences
- LinkedIn: [www.linkedin.com/in/arnaud-rajon]
- Email: [arnaud.rajon@epfl.ch]
Last Updated: [17.10.2025]