So a signature is more secure? I highly doubt that. Also, only bad banks will tell you this all the time, I was actually contacted by my bank when they suspected a fraudulent transaction. Didn't have to pay, and had the option to get a new one mailed right away and the old one disabled. If you lose your card you should always report it ASAP. It's also good to make the security code on the back unreadable, as well as be aware of your surroundings, something you really should be all the time.