This seems to me to be the defining journalism-whistle-blower story of this generation. It's rare in today's world when privileged people voluntarily choose to take steps whereby they give up comfortable lives to do something that is in the 'public good.' Mr. Snowden was clearly a computer whiz which explains why he got jobs at the CIA (including postings in Geneva under diplomatic cover). Booz Allen obviously did not hire him or pay him the $1,20,000 salary without Mr. Snowden showcasing some considerable technical expertise. I believe Mr. Snowden's expertise probably lies in having deep expertise in various flavors of Linux. That is what I am inclined to infer from his various job roles as a 'Systems Engineer' or 'System Administrator.' Being the self-driven sort of person that he was, I am sure he must be having good knowledge about networking and encryption stuff including but not limited to Cisco routers and related technologies.