Never fear, if you have nothing to hide, they will find out eventually.
Of course, they won't believe you at first, after all, everyone has something to hide.
So they will invite you politely to a secret military base somewhere on an undisclosed location for a bit of torture sessions, just a few years really, and they won't bother you with stuff like trials and sentencing, because hey, that's just bureaucracy, right? We all know who are the good guys, and if the good guys say you are a bad guy, then you must be at least a bit bad. Especially, if they say so in TV and newspapers.
It won't even hurt... much, and you could be always comforted that others have endured it, and so you will surely too, especially when you have no choice. Always a comforting thought.
And when those ten, fifteen years pass and the authorities will finally admit you probably really don't know anything, or when there will be demand for your cell, they will finally let you go, you will find out the world has changed. Your friends won't recognize you, some of them because of bad memory, some of them just in case, you know, to be sure that the stain of suspicion won't smear on them by talking to you, for example.
And maybe you won't recognize them either, who knows, maybe you won't even remember your name, and your past.
Isn't such a transformation... liberating? It's as if they have given you a whole new life to life.
Something to be grateful for, for sure...