Torture might stand too great a chance of destroying the encryption key. Though I suppose if nanotech were sufficiently difficult to obtain, the possible key-destructive effects of torture might be balanced against the probability of a car running over the keyholder in the meantime.
I would think that confusion (set things up so the key-keeper is confused and distracted, then do some phishing) is in the same reliability range as torture, and less likely to get the AI in trouble.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.