multi-factor authentication

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multi-factor authentication (commonly two-factor authentication, abbreviated 2FA or TFA) is an authentication process that requires at least a second component to a standard authentication method. Typically the second component is something user possesses, like a TOTP application or a hardware key (often USB).

See Also

  • SMS
  • TOTP
  • IndieAuth
  •, comprehensive list of sites and whether they support 2FA, which kinds, etc.
    • "Observe Ben, a veteran and expert in security and online systems. He's thoughtful, considerate, and organized.

      Our collective best practice approach to security just threw him under the bus. We need to do better, because most people are much less able to deal with this than Ben." @blaine May 7, 2018