Reversing 100 CSAW 2013
Credit to Ryan
This challenge was fairly simple you are given a .NET executable that prompts you for a password:
To see the password check function we used .NET reflector to view the source code. The source code is as follows:
All we needed to do to get the program to print the key is to find the result of num2 ^ num3 which is 13371337255. From here we put in 13371337255 and had the program print the key.