What does GCHQ know about our devices that we don't?
GCHQ are probably pretty far ahead of the game as far as disinformation goes. Consider what the UK government did to cover up operation overlord.http://en.wikipedia.org/wiki/Operation_BodyguardI seem to recall a story where they put fake plans in the pocket of an army coat, which they put on a recently deceased person dressed in full military uniform (of military service age), and then strategically dumped it where they knew the germans would find it. Or maybe that was just a spy movie I watched.