KalmarCTF 2023 - kalmarunionen-fun - Writeup

Learnings

• Don’t overthink it - we were about to cross reference Harry Potter spells
• Keep your old code around - my renderer was based on a 2014 project which really sped up the prototyping
• Live for this moment:

Writeup

• We found a bunch of data of a rumored accelerometer
• My first instinct was to render it
  • Maybe my first instinct should’ve been to make a kalman filter to smooth out the true position…
• I rendered it
• It was really painful to watch
• 2.5 hours before the end of the CTF I made a 3-axis + orbital renderer
• Likely if it would’ve clicked for us to just view it as 1s and 0s we would’ve got the flag