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To have and have not: Variations on secret sharing to model user presence


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Conference Object

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Authors

Stafford-Fraser, Q 
Warrington, C 
Jenkinson, G 
Spencer, M 

Abstract

We address the problem of locking and unlocking a device, such as a laptop, a phone or a security token, based on the absence or presence of the user. We detect user presence by sensing the proximity of a subset of their possessions, making the process automatic and effortless. As in previous work, a master key unlocks the device and a secret-sharing scheme allows us to reconstruct this master key in the presence of k-out-of-n items. We extend this basic scheme in various directions, e.g. by allowing items to issue a dynamically variable number of shares based on how confident they are that the user is present. The position we argue in this paper is that a multi-dimensional approach to authentication that fuses several contextual inputs, similar to that already adopted by major web sites, can also bring advantages at the local scale.

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Keywords

46 Information and Computing Sciences, 4604 Cybersecurity and Privacy

Journal Title

UbiComp 2014 - Adjunct Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing

Conference Name

UbiComp '14: The 2014 ACM Conference on Ubiquitous Computing

Journal ISSN

Volume Title

Publisher

ACM
Sponsorship
European Research Council (307224)