content: I was meaning to infer public key encryption and the like but didn't want to get specific. But yes, that is almost exactly what should be used for authentication and not your face which, with something almost as simple as a razor blade, can be irreversibly changed. I wont speak on how cryptography works, however, since I'm not well versed but, as with all things, some encryption methods are "better" than others. Whether better is stronger, more mathematically sound, or no known vulnerabilities is up for debate, lol.