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Sarah Delgado Rodriguez, Sarah Prange, Lukas Mecke, Florian Alt
Act2Auth â A Novel Authentication Concept based on Embedded Tangible Interaction at Desks
In TEI '24: Proceedings of the Eighteenth International Conference on Tangible, Embedded, and Embodied Interaction. February 07, 2024. Association for Computing Machinery, New York, NY, USA. (bib)

Authentication (e.g., entering a password) is frequently perceived as an annoying obstacle when interacting with computational devices, but still essential to protect sensitive data from unauthorized access. We present Act2Auth, a novel concept for embedding authentication into usersâ established routines by sensing tangible interactions at desks. With Act2Auth, users can authenticate by performing (secret) routines, such as putting a cup on their desk, rearranging their keyboard, and touching their mouse. The Act2Auth concept is informed by (1) an object analysis of 107 desk photos from Reddit, (2) an online survey (N = 65) investigating usersâ strategies for creating touch-based authentication secrets, and (3) a technical exploration of capacitive touch-sensing at desks. We then (4) implemented a prototype and evaluated the usability as well as the memorability of Act2Auth compared to textual passwords (N = 8). With Act2Auth, we provide fundamental work on how to embed authentication tasks into our daily tangible interactions.