There are three factors of authentication:

  • Something you know (such as a password or PIN)
  • Something you have (such as a smart card)
  • Something you are (using biometrics)

Biometrics can be very exact when the technology is implemented accurately. However, it is possible to get false readings. 

Two possible false readings are:

  • False acceptance. This is when a biometric system incorrectly identifies an unauthorized user as an authorized user.
  • False rejection. This is when a biometric system incorrectly rejects an authorized user.

True readings occur when the biometric system indicates a match.

Two possible readings are:

  • True acceptance. The biometric system accurately determines a positive match.
  • True rejection. The biometric system accurately determines a non-match.

 

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