3 ms·

Like those on a debit/credit card, or like NFC on phones?

• dredmorbius 9y ago
  Somewhat. NFCRing is closest I've seen to what I think of. http://nfcring.com http://nfcring.com
  • lazycouchpotato 9y ago
    While it might be convenient, someone could just steal your NFC device or skim the NFC chip and mirror it.
    • iamnothere 9y ago
      Properly implemented, NFC auth provides a secure challenge-response mechanism with a private key, so mirroring would not be possible. Theft is a potential problem, but so is shoulder-surfing. At least if your auth token goes missing then you know you've been compromised.
      • dredmorbius 9y ago
        Bingo.