This was the same in the UK: GHCQ had offensive and defensive arms. But they’ve since officially split; the defensive role is now taken by NCSC. Having said tha

This was the same in the UK: GHCQ had offensive and defensive arms. But they’ve since officially split; the defensive role is now taken by NCSC. Having said that, GCHQ is still its parent organisation and I have no doubt that they maintain strong ties.