Who Cares? Contextual Privacy Judgments from Owner and Bystander Perspectives in Different Smart Home Situations

Frik, A, Zhan, X, Abdi, N and Bernd, J (2025) Who Cares? Contextual Privacy Judgments from Owner and Bystander Perspectives in Different Smart Home Situations. Proceedings on Privacy Enhancing Technologies, 2025 (3). pp. 106-134. ISSN 2299-0984

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Abstract

Current privacy protections for smart home devices rarely consider bystanders' privacy, whose preferences are varied and may differ from primary users. We use Contextual Integrity theory to explore context-dependent variation in privacy norms regarding smart home bystanders’ data. We conducted a vignette-based survey with 761 participants in the US, varying parameter values to capture acceptability judgments regarding bystander information flows in certain situations: domestic work, shared housing, visiting a friend overnight, and Airbnb. We found that recipients and purposes of sharing impact acceptance the most. Sharing interaction logs was more acceptable than audio or video. Sharing smart speaker data was less acceptable than smart camera or smart door lock data. We found nuanced interaction effects between factors in different smart home situations, and differences between protections most favored by participants playing bystander vs. owner roles. We provide design and policy recommendations for smart home privacy protections that consider bystanders' needs.

Item Type:	Article
Uncontrolled Keywords:	46 Information and Computing Sciences; 4608 Human-Centred Computing; Clinical Research
Subjects:	Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions:	Computer Science and Mathematics
Publisher:	Privacy Enhancing Technologies Symposium Advisory Board
Date of acceptance:	23 January 2025
Date of first compliant Open Access:	3 September 2025
Date Deposited:	03 Sep 2025 13:20
Last Modified:	03 Sep 2025 13:30
DOI or ID number:	10.56553/popets-2025-0091
URI:	https://researchonline.ljmu.ac.uk/id/eprint/27081

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