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Security token
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==== NFC tokens ==== [[Near-field communication]] (NFC) tokens combined with a Bluetooth token may operate in several modes, thus working in both a connected and a disconnected state. NFC authentication works when closer than {{convert|1|ft|m|1|abbr=off|sp=us}}.{{Citation needed|date=March 2023|reason=This claim needs references to reliable sources.}} The NFC protocol bridges short distances to the reader while the Bluetooth connection serves for data provision with the token to enable authentication. Also when the Bluetooth link is not connected, the token may serve the locally stored authentication information in coarse positioning to the NFC reader and relieves from exact positioning to a connector.{{citation needed|date=October 2016}}
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