What I'm really getting at, though, is that I think playing cat and mouse with professional hackers is a losing game. You shouldn't spend a few seconds trying

What I'm really getting at, though, is that I think playing cat and mouse with professional hackers is a losing game. You shouldn't spend a few seconds trying to come up with something that they won't think of when it's their entire vocation. You're just not that creative, and too many people think alike. Just roll dice. That way your choice is provably random.