At the recent Usenix Enigma 2016 conference, NSA TAO chief Rob Joyce explains how his team works.
By the way, TAO means Tailored Access Operations, which is a euphemism for hacking.
See the full presentation here.
explains their methods, but between the lines he
implies that other nation states are doing the same, so in a way he
is here to help us.
For that reason he
also explains what makes their work hard.