A security token is a physical device used for authentication, often in conjunction with other authentication factors such as passwords, as one factor in a multi-factor authentication system. A security token may, among other things:

  • provide a time-synchronized, continuously changing password (such as RSA SecurID)
  • plug into a computer, containing digital certificates that are used along with a PIN for authentication (such as a USB dongle) or otherwise serving as an identifying device (such as a smart card)
  • be a mobile device (such as a smartphone) with an app that implements one or more features used in traditional security tokens

For more information on security tokens, see this Wikipedia article.

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