> far more sophisticated means of communication Or far more simple means. It's trivial, really, to write your own app for encrypted communication or signaling

> far more sophisticated means of communication Or far more simple means. It's trivial, really, to write your own app for encrypted communication or signaling. I bet I could build one in a day. Even without programming skills, you could set up a shared drive containing only a keepass file. Download the file, use your key and password to open it, then read the message. Monitor the last updated timestamp to see if there have been any changes. Securing your communications is not hard.