In general, it’s far easier to attack a network than it is to defend the same network. This isn’t a statement about willpower or budget; it’s how computer and network security work today. A former NSA deputy director recently said that if we were to score cyber the way we score soccer, the tally would be 462–456 twenty minutes into the game. In other words, it’s all offense and no defense.
In this kind of environment, we simply have to assume that even our classified networks have been penetrated. Remember that Snowden was able to wander through the NSA’s networks with impunity, and that the agency had so few controls in place that the only way they can guess what has been taken is to extrapolate based on what has been published. Does anyone believe that Snowden was the first to take advantage of that lax security? I don’t.
This is why I find allegations that Snowden was working for the Russians or the Chinese simply laughable. What makes you think those countries waited for Snowden? And why do you think someone working for the Russians or the Chinese would go public with their haul?
I am reminded of a comment made to me in confidence by a US intelligence official. I asked him what he was most worried about, and he replied: “I know how deep we are in our enemies’ networks without them having any idea that we’re there. I’m worried that our networks are penetrated just as deeply.”
Seems like a reasonable worry to me.http://www.wired.com/2015/06/course-china-russia-snowden-documents/