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An RFID reader system consists of an antenna connected to the proper "reader", i.e. hardware and software to process the signal received from the antenna, and then to the computer. A simple way to test RFID blocking would be to find the frequency used by your RFID tag, buy an appropriate RFID reader and antenna, put one card at a time into your wallet, ...


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The most-authoritative reference on EMV replay (i.e., transaction cloning) is Peter Fillmore's latest talk from Syscan 2015 https://github.com/peterfillmore/Talk-Stuff/blob/master/Syscan2015/PeterFillmore_Syscan2015.pdf Another great resource is Ricardo Rodriguez's talk from Rooted 2015 ...


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It depends on the card technology in use. If it uses "dumb" cards/tags that merely broadcast a block of data when powered on then all it takes to defeat it is to read that data block from a legitimate card and then simulate a card transmitting that data block. If the cards in use employ crypto such as Mifare DESFire (or HID cards though I have no experience ...


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Bruteforcing a RFID reader is possible in theory. For my school project, I did a RFID emulator that can clone the card and then emulate it. I am sure if you program the microcontroller instead of emulating the card it read, is to emulate all combinations from that range of numbers which represent the card id



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