Bruce gives a good collection of tips, but in his specific case it probably matters little. If he is a target of surveillance, I would be thoroughly surprised i

Bruce gives a good collection of tips, but in his specific case it probably matters little. If he is a target of surveillance, I would be thoroughly surprised if he did not get "black bag" intrusions (as he puts it). He is a target that is definitely high enough priority ("I have Snowden's documents!") that dedicating assets to investigation is more likely, and at that point an air gap seems more like an inconvenience to the attacker than true protection.