DP-ACT: Decentralized Privacy-Preserving Asymmetric Digital Contact Tracing

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Digital contact tracing substantially improves the identification of high-risk contacts during pandemics. Despite several attempts to encourage people to use digital contact-tracing applications by developing and rolling out decentralized privacy-preserving protocols (broadcasting pseudo-random IDs over Bluetooth Low Energy-BLE), the adoption of digital contact tracing mobile applications has been limited, with privacy being one of the main concerns.
In this paper, we propose a decentralized privacy-preserving contact tracing protocol, called DP-ACT, with both active and passive participants. Active participants broadcast BLE beacons with pseudo-random IDs, while passive participants model conservative users who do not broadcast BLE beacons but still listen to the broadcasted BLE beacons.
We analyze the proposed protocol and discuss a set of interesting properties. The proposed protocol is evaluated using both a face-to-face individual interaction dataset and five real-world BLE datasets. Our simulation results demonstrate that the proposed DP-ACT protocol outperforms the state-of-the-art protocols in the presence of passive users.
Original languageEnglish
Title of host publicationThe 24th Privacy Enhancing Technologies Symposium (PETS)
Publication statusAccepted/In press - 2023
Event24th Privacy Enhancing Technologies Symposium, PETS 2024 - Bristol, United Kingdom
Duration: 2024 Jul 152024 Jul 20


Conference24th Privacy Enhancing Technologies Symposium, PETS 2024
Country/TerritoryUnited Kingdom

Subject classification (UKÄ)

  • Media and Communication Technology


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