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For questions related to use of RFID (Radio Frequency IDentification) technology in IoT devices. For questions about the electronics aspect, consider asking at Electrical Engineering Stack Exchange.

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What would be the best way of authenticating users without password or username?

In the original idea, we thought it'd be good to have mobile tablets mounted at every machine, and give all of the users an RFID tag (a card really) to make them read by the tablet to authenticate the … But we've noticed that there are not too many tablets which supports NFC or RFID. So, right now we're looking for an alternative solution. …
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