Fourth-factor authentication: somebody you know
Proceedings of the 13th ACM conference on Computer and communications security
Exploiting social interactions in mobile systems
UbiComp '07 Proceedings of the 9th international conference on Ubiquitous computing
An introduction to biometric recognition
IEEE Transactions on Circuits and Systems for Video Technology
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Social interaction is already a proven component of informal identification: humans are naturally skilled at recognizing other people and are unlikely to be duped by impersonation. Based on this premise, a fourth-factor, someone-you-know, has already been proposed as an emergency authentication method. This paper explores leveraging a user's preexisting social actions as a primary authentication tool, one that operates transparently and automatically without explicit user guidance. Specifically, we describe the feasibility of capturing a user's local social context using short range wireless devices and evaluate the uniqueness of that context in comparison to that of possible aggressors.