A form of Voice Biometrics that is dependent on the same utterance used during enrolment being repeated during authentication or identification.
Most often used in automated systems with an Active Voice Biometrics approach. The biometric algorithm is optimised for how the user speaks the specific passphrase. As a result, it only requires short utterances for enrolment during registration and authentication/identification. This approach may also substitute the passphrase with a random digit challenge and response, telephone or account numbers or even a passphrase the customer has chosen themselves, but they all require the customer to record the specific words in advance.
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