Radio Frequency Identification (RFID) is a technology that allows you to identify the credit card, passport or driver's license in front of a reader scanner, instead of having to detect the code of the magnetic stripe.
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It 'a simple concept: the scanner sends an electronic signal that is received by an antenna connected to the RF chip card. The microprocessor is activated and the reader recognize the card.
This technology is also used in the systems of access control and time and attendance through electronic badges with an integrated RFID microchip (also called transponders or tags).
The advantages of using RFID cards are convenience, speed, and the elimination of contact with the card, but there is also a negative side. The chips based on radio frequency can be, easily, reading, copying and even manipulated by unauthorized persons.