Or course I like it when Reason interviews security expert Schneier. Most of it is just good summaries of what’s on his blog, but I liked this answer to the last question:
Security is designed to protect us from the dishonest minority. It’s important to remember that. I remember being told as a child: “Never talk to strangers.” That’s actually stupid advice. If a child is lost or scared or alone, the smartest thing he can do is find a kindly looking stranger to talk to. The real advice is: “Don’t answer strangers who talk to you first.” The difference is important. In the first case, the child selects the stranger—and the odds of him selecting a bad person are pretty negligible. In the second case, the stranger selects the child; that’s more dangerous. I don’t think that’s either optimism to rightly point out that most people are honest, or pessimism to figure out how to best secure ourselves from the dishonest minority; it’s analytical realism.