Vince wrote: |
If they can build it, they can modify it |
Dimitri wrote: | ||
RFID chips are one time programmable with a unique (typically 32-bit code), the more complicated ones like in your credit card can also transmit up to 32-bits of additional data (it does "math" on the chip to always give out a unique transaction authentication code). Once programmed however they are worthless and cannot be modified (the essentials anyways). There is typically a small spot for your PIN in your credit cards, a few bytes of data that is EEPROM, which would allow you to change your pin, and therefore the answers given by the RFID when near a scanner. Dimitri |
DallanC wrote: |
Someone could put one in a bag and walk around scanning everyone in the immediate area. |
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