[generalizations]

One implication of that - make sure there's no available means of parallel construction, and it's ok if they catch you in some way they don't want to reveal. As long as you're not valuable enough, that is.

[bombcar]

That's the real bar for any security, really - make it so it's not worth the while of people who could defeat it.

Because eventually, no matter what you do, if you're up against a nation state, they'll just make you dead.