"Logo of RFID blocking - a circle with a line crossed out and image of a signal in the centre"

RFID blocking symbol

The main types of RFID Blocking

RFID blocking reduces the readers transmitted signal power, preventing the microchip in the RFID card working, this means your data is safe. Essentially RFID readers transmit signals which power the microchip in the card, the microchip in the card powers up and sends data back to the reader. We prevent this by either deflecting/blocking RFID signals, or by transmitting a signal that interferes with the reader but this only works with one frequency and often a certain type of technology.

Contactless payment cards, ID cards, passports all use the same basic technology, Radio Frequencies IDentification commonly known as (RFID). Take your bankcard hidden in that thin card it contains a microchip linked to an antenna, passport or security pass. The cards and passports use a standard set of radio frequencies; that all bank contactless payment cards use 13.56 Mhz. Security passes, keys, product tags typically use 125 kHz as well as 13.56 Mhz.

Most RFID systems are designed to work at short-range, typically a few inches. However cards can be read at a meter with powerful RFID readers and the real concern 30+ meters by hackers.

Passive and Active RFID Blocking technology

Generally RFID blocking cards shields and protectors work in several ways. They are either passive or active. Passive shields or protectors can absorb the RFID signal or deflect it. Active RFID shields or protectors use a microchip and typically send out an interfering signal. It 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 your card. If the chip can’t receive enough power to function it can’t transmit a reply.

Deflected or absorbed RFID signals

Passive shielding works in two ways, reflective loss (bounced radio frequency energy) and absorption loss (energy/power absorbed in the shield). Both types reduce the transmitting rf signal that would power the RFID chip.

However deflecting or absorbing RFID signals for banking cards, contactless payment cards at 13.56 MHz is far simpler than blocking security cards and passes at 125 kHz. 125 kHz requires near field shielding to protect the RFID chip. This is why our RFID Cloaked products are a perfect choice because they protect all types of RFID signal.

We will talk about rfid blocking products in greater detail such as; a rfid-blocking wallet, rfid-blocking sleeve and rfid-blocking material.