Voice biometrics is the science of using a person’s voice as a uniquely identifying characteristic. One of the two ways we put voice biometrics into practice is called Text Dependent Voice Verification. The other is Text Independent Voice Verification.
Text Dependent biometrics depend on the text the person is speaking. This text is often referred to as a “voice passphrase.” The typical scenario for Text Dependent is a mobile or web login, a step-up authentication on mobile or web, or verifying identity through IVR authentication. Although Text Dependent is most commonly used with a passphrase that consists of three or four words that is about 1.5 seconds long, you can also use randomized numbers. User enrollment is active, meaning that the person must knowingly perform the enrollment and speak the required phrase.