A beginner-friendly CTF organized by the Dutch TU Delft CTF team where anyone could participate, and me and some friends got 3rd place
Malfunctioning Beads
A secret message encoded in the Portable Game Notation (PGN) of a chess game on lichess.org. Positions on the board are converted to Base64 characters
Happy Birthday
A crypto challenge where the goal was to create two strings, that when hashed, have the same 12 hex characters at the start. Use the Birthday Paradox to do this efficiently, with optimized code in Rust