Q: Why did you decide to become a whistleblower?

A: "The NSA has built an infrastructure that allows it to intercept almost everything. With this capability, the vast majority of human communications are automatically ingested without targeting. If I wanted to see your emails or your wife's phone, all I have to do is use intercepts. I can get your emails, passwords, phone records, credit cards.

"I don't want to live in a society that does these sort of things … I do not want to live in a world where everything I do and say is recorded. That is not something I am willing to support or live under."

Q: What about the Obama administration's protests about hacking by China?

A: "We hack everyone everywhere. We like to make a distinction between us and the others. But we are in almost every country in the world. We are not at war with these countries."

Q: Is it possible to put security in place to protect against state surveillance?

A: "You are not even aware of what is possible. The extent of their capabilities is horrifying. We can plant bugs in machines. Once you go on the network, I can identify your machine. You will never be safe whatever protections you put in place."

Q: Washington-based foreign affairs analyst Steve Clemons said he overheard at the capital's Dulles airport four men discussing an intelligence conference they had just attended. Speaking about the leaks, one of them said, according to Clemons, that both the reporter and leaker should be "disappeared". How do you feel about that?

A: "Someone responding to the story said 'real spies do not speak like that'. Well, I am a spy and that is how they talk. Whenever we had a debate in the office on how to handle crimes, they do not defend due process – they defend decisive action. They say it is better to kick someone out of a plane than let these people have a day in court. It is an authoritarian mindset in general."