Authors
Quentin Stafford-Fraser, Frank Stajano, Chris Warrington, Graeme Jenkinson, Max Spencer, Jeunese Payne
Publication date
2014/9/13
Book
Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing: Adjunct Publication
Pages
1313-1320
Description
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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Q Stafford-Fraser, F Stajano, C Warrington… - Proceedings of the 2014 ACM International Joint …, 2014