This is exactly what SFOR patents describe... and
Post# of 82668
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NIST
5.1.3 Out-of-Band Devices
An out-of-band authenticator is a physical device that is uniquely addressable and can communicate securely with the verifier over a distinct communications channel , referred to as the secondary channel . The device is possessed and controlled by the claimant and supports private communication over this secondary channel, separate from the primary channel for e-authentication. An out-of-band authenticator is something you have.
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