Edward Snowden hasnt escaped the NSAs watchful eyes purely by exploiting lax security — he also uses the right software. We now know that he communicates with the media using Tails, a customized version of Linux that makes it easy to use Tors anonymity network and other tools that keep data private. The software loads from external drives and doesnt store anything locally, so its relatively trivial for Snowden and his contacts to discuss leaks without leaving a trace.