Can you write deceptive messages in order to try to determine what kind of messages the government can decrypt?
The answer is throwing everything you have, and only some of the time reveal what you know.
This is effectively what we’re learning the government does through its FVEY[1] “partnerships”. Can’t spy on a US citizen? Have our neighbor do it and pass it back to us!
1. https://theintercept.com/2018/03/01/nsa-global-surveillance-...