Retinal scanners already exist, I use them sometimes to go to certain
co-lo stations;
They don't help. They are stupid. What you want is what we call "two
factor authentication", something you HAVE with something you KNOW.
So what will happen later is your camera will take a small card that has
your digital X509 certificate on it; and so you can swap cameras and
it's still YOUR image. It's like SIM cards for cell phones...or it will
be, but a lot more secure.
Albert
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