An undercover survey of more than 3,000 stores has found huge holes in wireless security networks.
When a store swipes your credit card, that information is broadcast wirelessly. That means hackers can hop on the network and steal your personal information.
A wireless security company, AirDefense, sent people with laptop computers into 3,000 stores in major cities to see what sort of electronic signals were flying through the air. In nearly a fourth of the stores, transmissions between handheld devices and mainframes had no security encryption. Another 25 percent used an easily broken password.