Capture The Flag

Capture The Flag (CTF)

A CTF (Capture The Flag) is a cybersecurity competition where participants solve a series of challenges to retrieve hidden flags (usually strings like CTF{...}).
These challenges cover a wide range of topics:

• Web (XSS, SQLi, etc.)
• System (reverse engineering, binary exploitation)
• Network (packet analysis, protocols)
• OSINT (Open Source Intelligence)
• Cryptography
• and many others

Each flag found scores points, and the goal is either to climb the leaderboard or simply learn by practicing.

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My CTF Participation & Results

Hackday - January 2026

• Result: 18th place out of 200+ teams
• Highlights:
  • OSINT
  • Forensinc
  • Web3
  • System

bpifrance “Mission Vérité” – September 2025 - OSINT CTF

• Result: 9th place out of 218 teams
• Highlights:
  • SOCMINT
  • IMINT / GEOMINT
  • RECON

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Master’s Year 2 CTF – 2024/2025

During our second year of Master’s, we organized our own CTF for fellow students.
The goal was to design realistic and diverse challenges that covered several key areas of cybersecurity:

• OSINT:
• Operating Systems: Linux, Windows, and Android environments
• Privilege Escalation: classic root/admin escalations on misconfigured machines or outdated systems
• System Challenges: binaries, processes, basic reverse engineering, …
• Network: packet sniffing and protocol analysis, …

Why it was valuable:

• We experienced what it means to build and test challenges rather than only solve them
• It required teamwork, creativity, and attention to balance (difficulty vs. accessibility)
• Designing scenarios gave us a deeper understanding of vulnerabilities and exploitation paths

This project was a highlight of my CTF journey, since organizing a competition is a different but equally challenging perspective compared to being a player.

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This page will be updated with my future results and writeups!