{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,25]],"date-time":"2025-09-25T16:33:11Z","timestamp":1758817991745},"reference-count":0,"publisher":"Privacy Enhancing Technologies Symposium Advisory Board","issue":"1","license":[{"start":{"date-parts":[[2024,1,1]],"date-time":"2024-01-01T00:00:00Z","timestamp":1704067200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["PoPETs"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.56553\/popets-2024-0019","type":"journal-article","created":{"date-parts":[[2023,10,22]],"date-time":"2023-10-22T21:01:15Z","timestamp":1698008475000},"page":"330-342","source":"Crossref","is-referenced-by-count":3,"title":["DP-ACT: Decentralized Privacy-Preserving Asymmetric Digital Contact Tracing"],"prefix":"10.56553","volume":"2024","author":[{"given":"Azra","family":"Abtahi","sequence":"first","affiliation":[{"name":"Lund University"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mathias","family":"Payer","sequence":"additional","affiliation":[{"name":"EPFL"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amir","family":"Aminifar","sequence":"additional","affiliation":[{"name":"Lund University"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"35752","published-online":{"date-parts":[[2024,1]]},"container-title":["Proceedings on Privacy Enhancing Technologies"],"original-title":[],"deposited":{"date-parts":[[2023,10,22]],"date-time":"2023-10-22T21:01:40Z","timestamp":1698008500000},"score":1,"resource":{"primary":{"URL":"https:\/\/petsymposium.org\/popets\/2024\/popets-2024-0019.php"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,1]]},"references-count":0,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2024,1]]}},"alternative-id":["10.56553\/popets-2024-0019"],"URL":"https:\/\/doi.org\/10.56553\/popets-2024-0019","relation":{},"ISSN":["2299-0984"],"issn-type":[{"value":"2299-0984","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,1]]}}}