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Where Have You Been? Using Location-Based Security Questions for Fallback Authentication
Alina Hang, and Alexander De Luca, University of Munich; Matthew Smith, University of Bonn; Michael Richter and Heinrich Hussmann, University of Munich
In this paper, we propose and evaluate the combination of location-based authentication with security questions as a more usable and secure fallback authentication scheme. A four weeks user study with an additional evaluation after six months was conducted to test the feasibility of the concept in the context of long-term fallback authentication. The results show that most users are able to recall the locations to their security questions within a distance of 30 meters, while potential adversaries are bad in guessing the answers even after performing Internet research. After four weeks, our approach yields an accuracy of 95% and reaches, after six months, a value of 92%. In both cases, none of the adversaries were able to attack users successfully.
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