Traditionally ID verification is all about two or more things – something you know (knowledge factor), something you have (possession factor) and something the user is (biometric factor).
VB [ed. Voice Biometrics] is one of the strongest and most convenient of these three, with a few seconds of natural speech removing the need for pin numbers, date of birth, mother’s maiden name and so on. All of which are increasingly easy to get hold of from social media sources and targeted malware stealing pins and passwords.
Read the whole thing. Voice biometrics seem to be improving rapidly and there is a huge installed base of networked hardware — land line phones — for which voice is the only biometric option.