Defend your smartphone from voice impersonators gaining access to your bank account.
It's a lot easier to talk to a smartphone than to try to type instructions on its keyboard.
This is particularly true when a person is trying to log in to a device or a system: Few people would choose to type a long, complex secure password if the alternative were to just say a few words and be authenticated with their voice.
The most common methods for securing voice-based authentication involve only ensuring that analysis of a spoken passphrase is not tampered with; they securely store the passphrase and the authorised user's voiceprint in an encrypted database.
Fortunately, there are automatic speaker verification systems that can detect human imitation.
Conventional speakers contain magnets, which vibrate back and forth according to fluctuations of electrical or digital signals, converting them into sound waves in the air.