A neighbor hacks into your encrypted wireless network on a daily basis, but you didn't give him the password. Which, if any, loopholes were most likely left open?

Note: Your password is updated through email via your company's mail server. You haven't updated the password. Why? What changed the password? How did the attacker change the password? What systems did the virus attack?

Is there a way to save a password other than encrypting it?

It is possible for software running on a desktop computer to produce safe secret keys that may then be used in cryptographic protocols.