What we need to do is we need to create new international standards of behavior - not just national laws, because this is a global problem. We can't just fix it in the United States, because there are other countries that don't follow U.S. laws. We have to create international standards that say that cyber attacks should only ever occur when it is absolutely necessary.

When we look at how, constitutionally, only Congress can declare war, and that is routinely ignored. Not NATO or the UN, but Congress has to authorize these endless wars, and it isn't.

I don't think political reform is likely to succeed. [Senators Tom] Udall and [Ron] Wyden, on the intelligence committee, have been sounding the alarm, but they are a minority.

I believe that when [senator Ron] Wyden and [senator Mark] Udall asked about the scale of this, they [the NSA] said it did not have the tools to provide an answer. We do have the tools and I have maps showing where people have been scrutinised most. We collect more digital communications from America than we do from the Russians.

All those people who went out [to Occupy Wall Street] missed work, didn't get paid. Those were individuals who were already feeling the effects of inequality, so they didn't have a lot to lose. And then the individuals who were louder, more disruptive and, in many ways, more effective at drawing attention to their concerns were immediately castigated by authorities. They were cordoned off, pepper-sprayed, thrown in jail.

I carefully evaluated every single document I disclosed to ensure that each was legitimately in the public interest. There are all sorts of documents that would have made a big impact that I didn't turn over, because harming people isn't my goal. Transparency is.

I know that fundamentally, changes to the fabric of the internet, and sort of our methods of communication, can enforce our rights.