Master Keys

Not a physical key at all, and not a password either. The master keys are the missing pieces of the Gates the Changed used to force the two warring factions out of the solar system, and then lock them out. The keys are the storage devices that carry the original code used to operate the Gates, and without them, the Gates will not even transmit a communications signal. Their location is currently known only to a few, and access only granted if the appropriate parties are gathered in two separate places, and accessed simultaneously in each place