RFID Key Code Security ...

FHWA Freight Management and Operations - Electronic Cargo Seals: Context, Technologies, and Marketplace - Chapter 1

... "approaches use electronics to control the operation of locks and seals. One approach programs a lat/long location or key code into the seal, which will not open until an internal or external device confirms the correct location or code. Another approach enables remote control of the locking mechanism via satellite or radio frequency (RF) messages. " ...