The identity of every human subject is imprinted in the subject's mind. This work explores one possible approach to authentication of the user identity using implicit long-term memory, specifically, memory for faces. New elements include social-emotional associated actions similar to episodic memories used in the training and authentication procedure. Also in contrast with related studies, the method is designed to defeat shoulder-surfing attacks: even prolonged observation of the authentication procedure does not allow a third party to learn how to pass the challenge without special training. Potential applications, problems and ideas of alternative approaches are discussed.
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