13 - The Sandboxed Terminal

Since the zombie apocalypse started people did not stop to ask themselves how the whole thing began. An abandoned military base may lead to answers but after infiltrating the facility you find yourself in front of a solid steel door with a computer attached. Luckily this terminal seems to connect to a Python service on a remote server to reduce load on the small computer. While your team managed to steal the source, they need your Python expertise to hack this service and get the masterkey which should be stored in a file called key. https://ctf.fluxfingers.net:1238/c7238e81667a085963829e452223b47b/sandbox.py
 

credits: 400 +3 (1st), +2 (2nd), +1 (3rd)