New Credit Cards Can Broadcast Your Personal Information

You may be carrying a new type of credit card that can transmit your personal information to anyone who gets close to you with a scanner. The new cards--millions of which have been issued over the past year--use RFID, or Radio Frequency Identification, technology. RFID allows scanners to use radio signals at varying distances to read information stored on a computer chip. According to a study from academic and business researchers at the University of Massachusetts, RSA, and Innealta, many of the cards will transmit your name, credit card number, and expiration date (but not the three-digit security code) in the clear to anyone nearby with a scanner. One of the researchers, Kevin Fu of the University of Massachusetts, provided an electronic copy of the report's just-finished final version to PC World. The draft version is available online. RFID is widely used to track shipments and store inventory--and now it's in credit cards, allowing customers to swipe the cards past readers in McDonald's restaurants, CVS pharmacies, and elsewhere, making for quick and easy transactions. Visa says more than 6 million "contactless" cards exist worldwide, and their number is growing rapidly.