Universal 2nd Factor (U2F) (noun)

An open standard for hardware authentication tokens that use the universal serial bus, or USB, near-field communications, or NFCs, or Bluetooth to communicate one factor in a two-factor authentication exchange.
Cyberwire Glossary link: https://thecyberwire.com/glossary/u2f
Audio reference link: “Rise of the Machines: A Cybernetic History,” by Thomas Rid, Published by W. W. Norton Company, 21 November 2017.
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