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[Music] these are RFID cards different form factors credit card size button size you probably seen keychain style as well they all work the same way you give them the reader and the unique ID shows up on the screen the way they work is when you get near the reader this coil on the outside gets energized by the changing magnetic field in the reader that powers up this little speck of dirt there which is an integrated circuit which transmits out its unique ID the unique ID is between 26 and about 42 bits in plain text unencrypted which means anytime you get near a reader your cards will transmit so here comes card number 0 1 2 4 0 heres card number 107 so now that we know how it works this is what anyone with a few hundred dollars in parts and some spare time can put together looks like a regular messenger bag inside of it its a long range reader works from a few feet away your card doesnt have to be out we can just walk past each other and I can read your card the other part of this
