BUCHAREST // CYBERSECURITY, CTFS, AND PROJECTS
ENTER THE
ATTACK
SURFACE.
I am Matei Martin. I use this site to document CTF challenges, security tools I build, and the problems that taught me something useful.
START HERE // FOUR PLACES TO EXPLORE
Pick a place and look around.
The archive is the main record, but it is not the whole site. You can browse topics, learn more about me, or get in touch.
LATEST POSTS
Signal Archive
CTF writeups, project notes, and security problems I have worked through. Each post covers what I tried and what finally worked.
OPEN SIGNAL ARCHIVE ↗BROWSE BY TOPIC
CTF Sectors
Browse posts about web exploitation, reverse engineering, forensics, OSINT, cryptography, and other CTF topics.
OPEN CTF SECTORS ↗ABOUT ME
The Operator
A short introduction, the competitions I have taken part in, and the projects and certifications I am proud of.
OPEN THE OPERATOR ↗GET IN TOUCH
Secure Uplink
Want to compare notes, work on something together, or ask about a writeup? This is the place to reach me.
OPEN SECURE UPLINK ↗LATEST POSTS // 15 PUBLISHED
Recently added.
The latest CTF writeups, projects, and security notes. Everything here comes from something I actually worked on.
Browse all posts →A-D-Agent Tool Introduction
A flag farming tool for Attack And Defense (A&D) CTFs
UNbreakable Romania Teams 2025 Write-ups
Write-ups for the online phase of the UNbreakable Romania Teams 2025 competition.
ROCSC 2025
Write-up for the challenges I solved during the ROCSC 2025 CTF.
Hack The Box - ReplaceMe
Write-up for the ReplaceMe challenge.
HOW I WORK
Build things, break things, and write down what worked.
I add to this site when a challenge, project, or mistake leaves me with something worth sharing.
About me →