gryfman

Whoami

sussetnoe2004@gmail.com (gryfman) — Mon, 13 Apr 2026 14:11:02 +0200

Hello I’m Gryfman, a fifth-year student at EPITA specializing in Systems, Networks and Security (SRS). Currently doing an internship as a pentester, I’m passionate about cybersecurity, with a particular interest in penetration testing and red teaming.

Challenges

Here is a list of stats from some of the platforms I use to practice my skills, or results from some of the CTFs I participated in:

CTF	Rank
FCSC 2026	22 overall, 11 in senior, 2nd in hardware
FCSC 2025	33 overall, 21 in senior
404 2025	69

A la recherche du wapiti ⭐⭐⭐

sussetnoe2004@gmail.com (gryfman) — Mon, 13 Apr 2026 11:44:43 +0200

Introduction

A la recherche du wapiti is a 3-star challenge from the FCSC. Here is the statement:

While traveling in northern China, you find sensors in your accommodation.
These are based on ESP32C3, but they seem to speak a language you do not understand.

Armed with your Wi-Fi card and your tools, you manage to retrieve the firmware from one of the ESP32 devices.

We are provided with the firmware of an ESP32-C3 device and a pcap of the Wi-Fi traffic.

Spaghetti Badge ⭐⭐⭐

sussetnoe2004@gmail.com (gryfman) — Mon, 13 Apr 2026 11:44:43 +0200

Introduction

Spaghetti Badge is a 3-star challenge at the FCSC. Here is the statement:

1Mr. Spaghetti designed a rather unique light-up badge... let's just say he didn't wire the LEDs in the most optimal way. This badge features a 120x24 WS2812B LED matrix that displays a flag. The microcontroller controlling the LED matrix is a WCH CH32V003F4U6.
2
3The PCB fabrication data for this badge and its firmware are available. Will you be able to figure out this flag?
4
5Note: The order of the copper layers follows the standard convention, i.e., F.Cu, In1.Cu, In2.Cu, In3.Cu, In4.Cu, and then B.Cu. The silkscreen Gerber file is not provided; it is up to you to determine the placement and orientation of the components.

We are provided with files in Gerber format and the firmware of the microcontroller.