The point is that the raw unencrypted "secret" - your actual fingerprint or retina print - is directly collected for various purposes by various agencies, which can easily leak it.
However, even worse than that, your fingerprint in particular is something you leave literally everywhere you go. There was even a demonstration of someone copying Gerhard Schroeder's (German PM) fingerprint from a still photo of him from a bottle he had touched, and then creating a mold which fooled a sensor they had access to.
However, even worse than that, your fingerprint in particular is something you leave literally everywhere you go. There was even a demonstration of someone copying Gerhard Schroeder's (German PM) fingerprint from a still photo of him from a bottle he had touched, and then creating a mold which fooled a sensor they had access to.