Identifying and authenticating a user in an environment such as their home or office typically requires the user to use a key, punch a code in a keypad, carry a smartphone, carry a key fob, etc. Each one of these options has drawbacks from a user experience standpoint and in some cases can be abused or spoofed.
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Chang, Lawrence, "Smart Footwear with Toe Print Sensors", Technical Disclosure Commons, (August 29, 2018)