Abstract: A system and method for controlling access to a moveable enclosure are provided. The system includes a lock on the moveable enclosure, a control circuit coupled to the lock and configured to i) receive an entry code and ii) open the lock in response to receipt of the entry code, a time measurement device and/or Global Positioning System device coupled to the control circuit and configured to generate time and position data, such as latitude and longitude data, relating to the moveable enclosure; and a personal computing device wirelessly coupleable to the control circuit and configured to generate the entry code using the latitude and longitude data. The entry code may be erased after a single use. The validity of entry code may depend upon the time of its entry and the physical location of the moveable enclosure.