Biometric
Authentication using a physical or behavioral trait — fingerprint, face, voice, gait.
FAR (false acceptance rate) and FRR (false rejection rate) trade off against each other; the crossover error rate (CER), where the two are equal, is the standard single-number accuracy measure — lower CER is better. Because a biometric trait can’t be reissued once compromised, biometrics work best as one factor within MFA rather than as a sole credential.
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