Even if that is the case, it still takes two people to get at the keys. Plus, it takes a crewman to do the actual retargeting. The odds of the captain, or even the XO, knowing how to sit at the keyboard and doing that is slim.
In other words, it would take the sub's screw to go rogue, not just the CO.
It was kinda like the KWT-26 and KWR-26 (I think I remembered those designations correctly) coding transmitter and coding receiver. If someone wanted to restart the code stream over again, therefore allowing anyone to break the new transmissions, as well as the old (like we did with the Russians a lot), it would have taken four people in which to do it.
The equipment used IBM punch cards to create the encoded stream (this was the early 1970s afterall
). When the cards are inserted, they are cut in half when the door is closed. When the door is opened, the spring loaded loaded would split apart and were impossible to get back together again. But, I was shown a little trick whereby the door could be partially opened and the sensing switch would indicate that the door was opened, without the card sprining apart.
The problem is that two people at the KWT site and two people at the KWR site were required to change the cards. The enlisted due that did the actual card changing and the duty officer that had to sign for the card. Sure, it really only takes the two enlisted operator to do the card changing and transmission restarting, others in the room would see it happening.
The Russians, on the other hand, seemed to have really lax procedures and or crappy equipment, as we got at least one "bust" a shift, if not more. The tape that was recording the transmission would be marked as well as the tapes of previous and future recordings that used that code stream.
I was a CTM2 (E5 Communication Technician Maintenance), or what was affectionately known as a lightning fast chicken plucker. Look at the rating badge and you'd understand why.