A definition from "what is": - Shoulder surfing is using direct observation techniques, such as looking over someone's shoulder, to get information. Shoulder surfing is an effective way to get information in crowded places because it's relatively easy to stand next to someone and watch as they fill out a form, enter a PIN number at an ATM machine, or use a calling card at a public pay phone. Shoulder surfing can also be done long distance with the aid of binoculars or other vision-enhancing devices. To prevent shoulder surfing, experts recommend that you shield paperwork or your keypad from view by using your body or cupping your hand.
The reason I am putting this information out there is to make everyone aware that this could happen to you. My card number was stolen last week, without my knowledge. Keep your card number hidden in your hand as you hand it to the cashier. People around you can easily get the number by taking a picture with a camera phone, and then, using the information to purchase items. It's bad because you don't even know when it happens. I still have my card, so I had no idea that someone was walking around making purchases with it. Yesterday, they tried to make a purchase of $500. Luckily, the bank called me and asked me if I had authorized the transaction. Now, I have to wait for a new debit card, and I hope the transaction doesn't go through because the money is not there. It just makes for a lot of hassle. Be careful out there!!
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