Snowden, meanwhile, dismissed NSA claims that he had swiped as many as 1.7m documents from the agency's servers in an interview with Vanity Fair. He described the number released by investigators as "simply a scare number based on an intentionally crude metric: everything that I ever digitally interacted with in my career."He added: "Look at the language officials use in sworn testimony about these records: 'could have,' 'may have,' 'potentially.' They're prevaricating. Every single one of those officials knows I don't have 1.7m files, but what are they going to say? What senior official is going to go in front of Congress and say, 'We have no idea what he has, because the NSA's auditing of systems holding hundreds of millions of Americans' data is so negligent that any high-school dropout can walk out the door with it'?"In live testimony to the Council of Europe, Snowden also gave a forensic account of how the NSA's powerful surveillance programs violate the EU's privacy laws. He said programs such as XKeyscore, revealed by the Guardian last July, use sophisticated data mining techniques to screen "trillions" of private communications."This technology represents the most significant new threat to civil liberties in modern times," he declared.