A Canadian university is researching using your thoughts to authenticate you on your computer:
Their idea of utilizing brain-wave signatures as "pass-thoughts" is based on the premise that brain waves are unique to each individual. Even when thinking of the same thing, the brain’s measurable electrical impulses vary slightly from person to person. Some researchers believe the difference might just be enough to create a system that allows you to log in with your thoughts.
This sounds interesting, but not very secure. Theoretically couldn’t someone in the same room scan your brainwaves and play them back to gain access to your computer? What if you couldn’t concentrate on your pass-thought? And what if you were stressed?
A neat idea though.
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