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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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How do NFC tags prevent copying?

NFC tags (as defined by the NFC Forum) have no protection against cloning. Such tags are intended as containers for freely readable data (so called NDEF messages). … Many NFC tags also contain a unique identifier that is pre-programmed by the tag manufacturer and cannot be modified on normal tags because those memory segments are in read-only memory. …
Michael Roland's user avatar