Skimming is the theft of credit card information by a dishonest employee of a legitimate merchant, manually copying down numbers, or using a magnetic stripe reader on a pocket-sized electronic device. Common scenarios for skimming are restaurants or bars where the skimmer has possession of the victim’s credit card out of their immediate view. The skimmer will typically use a small keypad to unobtrusively transcribe the 3 or 4 digit Card Security Code which is not present on the magnetic strip.

Many instances of skimming have been reported where the perpetrator has put a device over the card slot of a public cash machine (Automated teller machine), which reads the magnetic strip as the user unknowingly passes their card through it. These devices are often used in conjunction with a pinhole camera to read the user’s PIN at the same time.

To prevent this type of fraud, cards in countries such as the UK are issued featuring a smart chip with public key encryption. The chip cannot be copied, but the card number, expiry date and security code can be, and this set of data is often sufficient to use the victim’s credit card account for fraudulent purposes with so-called “card not present” transactions, e.g., manual input, over the telephone or internet.

 Skimming is a growing problem today and you should always be extremely careful with your credit cards. Always check the ATM machine for any sign of misuse (cameras overlooking the keyboard or some insert in the slot for the credit card). Be sure you always have your card in view when paying in shop or restaurant.