Red Button and Yellow Button: Usable Security for Lost Security Tokens

  • Ian Goldberg
  • Graeme Jenkinson
  • David Llewellyn-Jones
  • Frank StajanoEmail author
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10368)


Currently, losing a security token places the user in a dilemma: reporting the loss as soon as it is discovered involves a significant burden which is usually overkill in the common case that the token is later found behind a sofa. Not reporting the loss, on the other hand, puts the security of the protected account at risk and potentially leaves the user liable.

We propose a simple architectural solution with wide applicability that allows the user to reap the security benefit of reporting the loss early, but without paying the corresponding usability penalty if the event was later discovered to be a false alarm.


The authors with a Cambridge affiliation are grateful to the European Research Council for funding this research through grant StG 307224 (Pico). Goldberg thanks NSERC for grant RGPIN-341529. We also thank the workshop attendees for comments.


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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Ian Goldberg
    • 1
  • Graeme Jenkinson
    • 2
  • David Llewellyn-Jones
    • 2
  • Frank Stajano
    • 2
    Email author
  1. 1.University of WaterlooWaterlooCanada
  2. 2.University of CambridgeCambridgeUK

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