RFID skimming

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RFID skimming is a method to unlawfully obtain data from someone's contactless smart card used for payment or identity document using a RFID reading device. Modern payment utilize an RFID chip to transmit card information wirelessly to enable contactless payments, which has become increasingly common. Criminals can take advantage of this technology by using a scanner to wirelessly read a victim's payment card in the same way that a cash register scans it when making a contactless payment. Most modern mobile telephones running Android OS have a built in NFC reader that can be used to unlawfully scan contactless payment cards. A criminal can hide the scanner e.g. inside a glove or a bag, and then place it close to the victim and wirelessly steal the victim's payment card information. With the wirelessly obtained payment card information, the criminal can use it to make fraudulent purchases online. This is called card-not-present fraud. Methods similar to RFID payment card skimming may also be used for copying other RFID-based proximity cards, such as those used for keycard locks. 125 kHz RFID and other systems relying on a unique identifier number (UID) are vulnerable to this. Prevalence of RFID skimming has been disputed.