i think fingerprints it's not that secure, it can be repliacated easily, by using the victim fingerprint, on any material that he/she may have touched, it's better to do it in another way like retina yes, or particolare code done with some gestures?
Good fingerprint replicas aren't easy to make. They take time and that's probably not feasible in most attack vectors.
Not sure I understand what you mean by gestures...
