Shake well before use: two implementations for implicit context authentication
R. Mayrhofer, H. Gellersen - Shake well before use: two implementations for implicit context authentication - Proceedings of Ubicomp 2007, Innsbruck, Österreich, 2007, pp. 72-75
Secure device pairing is especially diﬃcult for spontaneous interaction in ubiquitous computing environments because of wireless communication, lack of powerful user interfaces, and scalability issues. We demonstrate a method to address this problem for small, mobile devices that does not require explicit user interfaces like displays or key pads. By shaking devices together in one hand for a few seconds, they are securely paired. Device authentication happens implicitly as part of the pairing process without the need for explicit user interaction “just for security”. Our method has been implemented in two variants: ﬁrst, for high-quality data collection using wired accelerometers; second, using built-in accelerometers in standard Nokia 5500 mobile phones.