Which enemy are GCHQ and NSA fighting?

Hint: They both named their major programs aimed at undermining all internet decryption after Civil War battles. (Edgehill for the British, Bull Run for the US). So they’re not thinking of an external enemy, are they?

I suspect that the huge effort the US has put into decrypting SSL — which will eventually get out into the wild, of course, and hugely disrupt commerce worldwide, will come to be seen as the information warfare equivalent of the huge investment that the US and Soviets put into perfecting sarin and other nerve agents, and making them cheap and easy to produce.