A beginner-friendly CTF organized by the Dutch TU Delft CTF team where anyone could participate, and me and some friends got 3rd place

Post thumbnail
WebScriptingEncodingMiscellaneous+296 points

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

Post thumbnail
ScriptingEncodingCrypto+210 points

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