Skimmers

How they work

Skimmers, devices that thieves attach to ATMs or gas pumps to steal your debit account number and password, have been around for years—and they're not going away. They're getting even more sophisticated.

The devices are placed at the mouth of the card-acceptance slot and record the data off of the magnetic strip on the back of your ATM card when you slide it into the machine. Crooks will usually plant a second device, such as a hidden camera or a transparent plastic PIN pad overlay, that's used to record your PIN when you type it in. In the early days of skimming, the thief had to return to the ATM or gas pump to retrieve the apparatus. But now, Krebs says, wireless technology enables the devices to be rigged to send account information via text message to the thief's cell phone. "The thief can be down the street in a coffee house or halfway around the world," he says. "As long as he's got a working phone signal, he can get the information sent to him right away and start using it."

Prevent it

Use credit cards and avoid using non-bank ATMs. Those machines are generally located in areas that are less secure, making it easier for thieves to tamper with them. And check the card slot: If there's a plastic strip or plastic film sticking out, or anything glued to the card reader, go elsewhere. If your card is stuck inside the card slot, do not leave the machine. Use your cell phone to call your bank branch or the 24-hour service number to report the problem.