Predicted and observed user behavior in the weakest-link security game

  • Authors:
  • Jens Grossklags;Nicolas Christin;John Chuang

  • Affiliations:
  • UC Berkeley/School of Information;CMU/CyLab Japan;UC Berkeley/School of Information

  • Venue:
  • UPSEC'08 Proceedings of the 1st Conference on Usability, Psychology, and Security
  • Year:
  • 2008

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Abstract

We aim to advance the understanding of individual security decision-making, by combining formal and behavioral analysis. We sketch a game-theoretic model of security decision-making that generalizes the "weakest link" game, and describe a controlled laboratory experiment to reveal differences between predicted and observed user behavior. Results of a pilot study yield possible explanations for behaviors observed in the wild: users show some willingness to experiment with parameters, rarely converge to a fixed behavior, and face difficulties isolating the impact of individual parameters.