I worked at a videoconferencing hardware/software company. We provided systems to USA government offices like the NSA and State Department and provided an input for which they gave us hardware specs but told us nothing else, the customer did the final testing on it to make sure it worked as specified. We assumed it was for some sort of encryption method of which they revealed to us as little as possible, the hardware engineers who saw it tested only saw a large, portable black box. Otherwise our system used the standard encoding/decoding methods of the day in the 1990s.