[IT] CrowdNotifier: Decentralized Privacy-Preserving Presence Tracing

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    CrowdNotifier: Decentralized Privacy-Preserving Presence Tracing ("The Luca App done properly")

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  • There 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 talk, I introduce 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.