Security is a moving target. The moment you assume your defense is finished, someone is already building the tool that beats it.
The best authentication is the kind nobody feels. If a legitimate customer has to fight their way through it, you have built something that irritates the right people along with keeping out the wrong ones.
Passwords ask people to prove they remember something. Voice asks them to prove they are someone.
Some banks are turning to voice biometrics to verify customers' identities during calls to service centers, amid rising losses from identity fraud. The technology compares a stored…