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NFC (Near-Field Communication) is a short-range wireless technology, typically requiring a distance of 4cm or less to initiate a connection between two endpoints.

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format NFC cards that require an encryption code to be sent first before the data area becomes readable/writable, preventing card access without knowing the code for the card (I don't know if this … conforms to NFC spec or not), or requiring multiple factors for authentication (such as passcodes, biometric information, etc), which would mean that a single factor would not be enough for impersonation. …
answered Jul 2 '15 by Aaron D