RFID blocking refers to the use of materials or products that interfere with the electromagnetic field of an object, such as a credit card or passport, to prevent unauthorized access or theft of personal information. RFID-blocking material blocks the electromagnetic signal emitted from an RFID-enabled card, preventing the microchip in the card from working. RFID-blocking products include wallets, purses, backpacks, and even clothing that contain a layer of carbon fiber or aluminum to create a Faraday cage, which is an enclosure used to block electromagnetic fields. RFID-blocking shields block any signals to RFID-enabled cards so that no one can access the information without permission. RFID-blocking cards, shields, and protectors can either absorb the RFID signal or deflect it. Active RFID shields or protectors use a microchip to send out an interfering signal, which is effectively pretending to be another card causing a card clash issue in the reader, or it drains the power from the transmitting signal required to power the chip in the card.
While RFID skimming is a valid concern, most experts agree that RFID-blocking products are a waste of money. The danger of contactless credit card thefts is overblown, and the market for contactless payment cards has grown rapidly. However, it is always a good idea to safeguard your wallet and protect yourself with an RFID blocker.
