P25 only uses 56 bit encryption, there are better systems if you want to ensure that only the intended recipient will be able to receive your transmission. P25 is great for when you want to make sure that all your intended recipients can receive and intended senders can send, while minimizing undesired senders being received.
A couple of things to keep in mind, some of which are in the article, some aren't:
TETEA is mostly used by first responders. The primary benefit of first responders using encrypted comm is to prevent unauthorized users interfering with real time communication in a crisis.
While the US military uses TETRA in some overseas locations, it is mainly used to coordinate with local emergency services, and has never been viewed as a secure form of communication.
Lastly, not to be too US centric but TETRA is almost never used in America, where Project 25(P25) is mandated for most originations. P25 was developed after 9/11 as a radio interconnect standard for emergency services and first responders that allows radios to communicate regardless of manufacturer.
Ballance of terror would be great, I'd stage it with both bridges on stage, with the view screens facing each other center stage. while the action is happening on the enterprise have the lights on the Romulan bridge at 15-20% and vise versa. My production would sacrifice the surprise reveal in favor of some scenes on the Romulan bridge in act 1.
I spend a lot of time thinking and talking about DnD, but the closest I get to playing is a Group chat where every week people post "Sorry, Can't this week".
Code Violation