Comment Biometrics are usernames. (Score 1) 27
Biometrics are non-revokable usernames and should never be used to assert identity. They're easy to forge, have been proven forgeable by many studies and worst yet you can't change them if something goes wrong.
Again and again this comes up as a solution. It is the "convenience" side of the security triangle of cost, convenience, and security. While it makes things easy, it makes things a lot more insecure.