Under the NIST SP 800-63B Digital Identity Guidelines, organizations that wish to use biometric authentication must follow specific constraints. Which of the following statements correctly reflects those requirements?
Biometrics can serve as the sole factor for any authentication assurance level once the sensor meets a false-match rate of 1 in 10,000.
Biometrics may be used only as one factor in a multi-factor scheme that includes something you have, and users must be offered a non-biometric alternative.
Federal agencies are prohibited from employing biometrics for remote user authentication because biometric data is considered sensitive PII.
Once a biometric factor is deployed, organizations are not required to provide any alternative authentication mechanism unless the biometric system fails.
NIST SP 800-63B permits biometrics only as part of multi-factor authentication-specifically, in combination with a physical authenticator (something you have). Because biometrics are not secrets, their false-match rate is probabilistic, and they can be spoofed, the guideline also mandates that users be offered a non-biometric fallback method. Therefore, the correct choice is the one that includes both the multi-factor requirement and the obligation to provide an alternative factor. The other options contradict the guideline by either allowing biometrics as a sole factor, prohibiting all biometric use, or eliminating the requirement for an alternative method.
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Why can't biometrics be used as a sole factor for authentication?
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ISC2 CISSP
Identity and Access Management (IAM)
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