““The idea that the material is safe because it is encrypted is shockingly naïve: it is child's play for a sophisticated adversary to place malware on a computer, remotely and invisibly, which logs every key stroke, and records everything that appears on the screen. Such 'end-point vulnerabilities' render even the heaviest encryption pointless. They can be delivered via a mobile phone or through an internet connection (or by some other subtle and secret means). Snowden knows this. It is possible that someone with his technical skills could keep the stolen data secure on his own computers, at least for a time and if he does not switch them on. But that becomes ever less likely over time.””
