I recently saw a patent for a computer mouse that came with a barcode scanner. I was think that, for security, computer mice could come with retinal scanner so that you can scan your eye and login. Wouldn't that be cool (and secure).

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maybe, they could integrate a webcam with a retina scanner, but people with bad backs might not be able to use it.
The fingerprint scanner in my opinion is worse than the password, i 'hacked' into my friends computer because he doesn't believe the fingerprint sensor can be fooled. but after some memory latex, some handshakes, and some saliva I fooled the fingerprint sensor.
So a retina sensor would be a good idea, until someone fools it. but then what do we do? breath sensor?

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next step after that is the dna verifier, just insert a sample of blood and your good to go. A retinal scanner might not be such a bad idea if they can be made cheaply enough and whatnot, and as long as it doesnt give you eye cancer.............

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