Wait, what!?!
It actually takes real keys?
Yes, what truce did was use two keys for a signature, a dumbed down form of a key put in this example:
AAL## LLL# LL## #LLL
Basically, some combination such as that showing where the numbers and letters were. Then it pulls up random numbers and letters to fit in those spaces (besides AA). Potentially, it could be used a million times before it shows a real key, but eventually, given the amount of time it is used, it could remake the original keys that make the template for the "fake" keys.