Source: NYTimes transcript of Comey's testimoney at the Senate Intelligence Committee hearing
well:
Releasing information would also give information about your capabilities to your enemy. Important for "what did they found out, and what not" for the attacker and such.
The investigations is most likely still unresolved and ongoing. This being one of the biggest things to have hit modern elections I understand they want to be thurrough rather then hastily.
Retaliation attacks on what to do what? rig the russian elections?
The investigations might still be unresolved and ongoing
That is exactly what I mean by retaliation. The only way to truly understand what happened is to trace the attack to it's source and attack yourself. If the NSA has pinpointed exactly where the attack came from, there's no way they're going to just leave it there. They're going to start exploring.
The number of times Comey replied "I can't discuss this in an open session" also hints that there is a lot going on behind the scenes, from Russia meddling to Trump collusion and even Clinton. Even though he was very careful to not give away what his nonanswer was hiding.
This, to me, is confirmation that there is a lot of information being withheld. The leak the other day is barely scraping the surface.
My theory is that the NSA are conducting their own attacks in retaliation, and that is why the info is all still classified. Releasing it could be harmful to ongoing operations.