Archives security terminal is a holodisk in Fallout 3.
Location
It can be obtained from Button Gwinnett or found on the robot's "corpse" in the National Archives' Strongroom.
Transcript
The password to access the Strongroom Maintenance Terminal is "64070177".
Related quest
Notes
Though it no longer serves any purpose, this item is still found in the game files for Fallout: New Vegas.