This would be pretty easy to test. Just get a bunch of friends to start exchanging encrypted messages about bombing an embassy or govt office. If these douche-bags can break it, they'd be on you like white on rice.
That's an idea but not real sweet honey. After all your bombing could also lead to increases in their budget so why bother stopping you? If you are actually looking to make a test, include some real actionable high-stakes financial insider info and watch the futures market to see if anybody read your shit.