The Skull CTF

A mind-bending hardware puzzle in three acts

Apr 16, 2021

From Out the Muck

by Uri Shaked

Ahoy Mateys!

Hopelessly Stuck

Shouldst thou find thyself hopelessly stuck, as did one miserable soul who wrote to us, we emplore thee to armor thy spirit against dispair and consider performing the rituals revealed below:

  1. Flagellate thyself with the ATtiny45 datasheet. (It's long and not very easy to understand. We are aware. But it does contain everything you need to know about the ATtiny45 chip...)
  2. Redeem thy soul by watching the AVR: Architecture, Assembly & Reverse Engineering online course. You'll learn how to nagivate that enormous datasheet, explore the inner-workings of AVR chips, and fiddle with the simulator.

And when you truly hit bottom—when that final moment of existential dread comes for what remains of your dignity—we invite you to draw power from the following incantation: SatH’oTS IaGWtL. ¹

Early Furcula

"I think the difficulty change between the first two levels is just right for me, and I like how the challenges are building on top of the previous steps instead of being unconnected puzzles."

…said the first person to Capture the Flag. Will you be next?

ChallengeFirst to solveSolved to date
Hypnosisbburky4
Capture the FlagH|_|3H|_|31
Mind Control
The Virus
Medulla Oblongata

¹ Suffering at the Hands (?) of The Skull Is a Great Way to Learn



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