Google is rolling out a new smart lock, dubbed “Trusted Voice,” that uses your voice as a password to unlock your device. Device unlocking has become far more secure over the years, from PIN number unlock to Pattern unlock and biometric unlocks including fingerprinting and facial recognition. FBI has launched a huge database of biometric information, including images of users’ faces, DNA, voice samples, fingerprints, irises, and palms, along with the details of scars, tattoos, and other body marks. It is not clear whether Google will keep users’ voice samples on Android device locally or it would send it to their Cloud.
Source: https://thehackernews.com/2015/04/android-trusted-voice.html