Well, it looks like our traitor general has good computer security specialists at hand. Although it may be that it's just another, normal element of warfare in Garret's universe. That was how Adamant was first attacked. Computer viruses also played important role in the attack on Peladon. And now taking control of guidance systems on missiles and torpedoes. Yes, I'm really stating do dislike Garret. I'd like to blame Masako for this, her arrogance, her tendency to assess others at first glance, judging if they're good enough to be in her inner circle (Hint: I can't abide her, I'm interpreting everything she says and does against her, always looking for malicious intents. Don't know why, really.) But I don't think this is the case. He's doing this on his own.
Or, perhaps, I'm being a bitch and should re-read few last chapters when I'm in better mood