I don't spend all day running hand-on-hat from shadowy figures - I'm in exile.

The government would assert that individuals who are aware of serious wrongdoing in the intelligence community should bring their concerns to the people most responsible for that wrongdoing, and rely on those people to correct the problems that those people themselves authorized.

Much of what I saw in Geneva really disillusioned me about how my government functions and what its impact is in the world. I realised that I was part of something that was doing far more harm than good.

If an adversary didn't target our power plants but they did target the core routers, the backbones that tie our internet connections together, entire parts of the United States could be cut off. That would have a tremendous impact on us as a society and it would have a policy backlash.

The bare bones tools for a cyber-attack are to identify a vulnerability in the system you want to gain access to or you want to subvert or you want to deny, destroy, or degrade, and then to exploit it, which means to send codes, deliver code to that system somehow and get that code to that vulnerability, to that crack in their wall, jam it in there, and then have it execute.

Getting inequality out there into the consciousness was important. All these political pundits now talking about the 2014 and 2016 elections are talking about inequality.

I do not expect to see home again.