SecureAuth
"There is a building. Inside this building there is a level where no elevator can go, and no stair can reach. This level is filled with doors. These doors lead to many places. Hidden places. But one door is special. One door leads to the source." (The Keymaker)

Find the key. Open the door.

Static client @ http://static.challs.nuitduhack.com/SecureAuthClient.tar.gz

Score
350
Link
secureauth.challs.nuitduhack.com:4241