Lueks, WouterGürses, SedaVeale, MichaelBugnion, EdouardSalathé, MarcelPaterson, Kenneth G.Troncoso, Carmela2022-12-142022-12-142022-12-14202110.2478/popets-2021-0074https://infoscience.epfl.ch/handle/20.500.14299/193241There is growing evidence that SARS-CoV-2 can be transmitted beyond close proximity contacts, in particular in closed and crowded environments with insufficient ventilation. To help mitigation efforts, contact tracers need a way to notify those who were present in such environments at the same time as infected individuals. Neither traditional human-based contact tracing powered by handwritten or electronic lists, nor Bluetooth-enabled proximity tracing can handle this problem efficiently. In this paper, we propose CrowdNotifier, a protocol that can complement manual contact tracing by efficiently notifying visitors of venues and events with SARS-CoV-2-positive attendees. We prove that CrowdNotifier provides strong privacy and abuse resistance, and show that it can scale to handle notification at a national scale.Presence tracingproximity tracingprivacy preserving protocolstext::conference output::conference proceedings::conference paper