C.E. Evans wrote:
There could be countless layers of fractal encryption that an outside (non-Starfleet) computer has to get through just to get to the prefix code. It also may be accessible only from the bridge maybe.
Or available only to officers of command-level rank or higher. After all, it was Spock who provided Kirk with Reliant's
code, as though he had some sort secret code-book from which he took the information.