This repository contains files related to the TU Delft CTF 2024 hardware badge - a padlock-shaped laser-cut wooden badge with a Raspberry Pi Pico inside.
This repository contains the following:
- the source code of the firmware & files necessary to build it (
src/,CMakeLists.txt,pico_sdk_import.cmake) - the SVG files with the design of the badge (
design/) - a prebuilt firmware image (
firmware.uf2) - a dirty shell script we used to flash 200 picos (
flasher.sh)
To build the firmware, run the following commands or use the VS Code Raspberry Pi Pico extension:
$ mkdir -p build && cd build && cmake .. && make
Note that to build the firmware you'll need some dependencies - an instruction on how to install them is available on the Raspberry Pi website.
If you don't want to build the firmware yourself but still want to flash it on your Pico, you can use the provided firmware.uf2 file.
To flash the program to your Pico, either connect it to your computer while holding down the bootsel button and drag the firmware.uf2 file to the mass storage media that will appear, or run the following command after connecting the Pico:
$ picotool load firmware.uf2 -f
This second option requires picotool to be installed.
There are 4 challenges included in the firmware - Hello Hardware, Black Box, Entropy Encrypter and Weary Watchdog. You can find their descriptions in the TU Delft CTF 2024 challenge repository.
The main way of communicating with the badge is over the USB interface. After you connect the badge to your computer, it will show up as a serial device. The baudrate the badge is using is 115200. To interact with the badge, you might want to use PuTTY (if you're using Windows) or Screen or Minicom (if you're using a UNIX-based system, such as Linux or macOS).
Note: if you want to interface with the badge as a non-root user on Linux, you have to add your user to the dialout group and restart your machine.