CSAW 2012 Writeup - Reversing 200

Run the binary to see if there are any messages:

This is a .net binary, so we load it up in a .net decompiler.
Here are the encrypted key bytes:

Found the decryption routine upon further inspection:

Wrote a shell script to xor each byte with 255, decrypted message is The key is 9c09f8416a2206221e50b98e346047b7

Key: 9c09f8416a2206221e50b98e346047b7