We have biometrics, which replaces all that security with a unique aspect of your body, be it a fingerprint, iris scan, or now even the unique sound echo created by your ear. That last one has been developed by NEC Corp in collaboration with Nagaoka University of Technology
. They realized that the shape of an individual’s earhole is unique and therefore produces a unique sound echo given the right equipment.
http://www.geek.com/science/nec-uses-sound-echoes-in-your-ear-as-biometric-authentication-1649229/
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