Writeups
A la recherche du wapiti ⭐⭐⭐
reading time: 15 minutes
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 ⭐⭐⭐
reading time: 16 minutes
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.
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3The PCB fabrication data for this badge and its firmware are available. Will you be able to figure out this flag?
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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.