y-yu / tenet-simulator

Tenet simulator HITCON CTF 2020

Tenet simulator HITCON CTF 2020

Cheep assembly language emulator to solve Tenet in HITCON CTF 2020.

Demo

Scala.js demo is here: http://y-yu.github.io/tenet-simulator

How to run

./sbt run

Abstract of the problem: tenet

Note: the problem scenario is much simpler than original.

1. A secret random number will be give as EAX register value
   • Other registers are all zero
2. Then we'll run arbitrary assembly codes starting with the (1) register state
3. When the code execution ends, the system accepts if EAX is zero
   • If EAX is not zero, the system will fail
4. The system will execute the code that is reverse ordered code executed in (2)
5. When the reverse ordered code execution ends, if EAX equals to the secret random number in (1) then the system accepts