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About this paper
Justin Chan, Dean Foster, Shyam Gollakota, Eric Horvitz, Joseph Jaeger, Sham Kakade, Tadayoshi Kohno, John Langford and 5 more
The authors propose PACT, a 2020 protocol suite to support contact interviews, place-and-time public-health messages, and proximity tracing without requiring a central party to collect everyone’s location history. In its main protocol, phones exchange changing Bluetooth identifiers and locally record received signals; positive users may publish seeds for matching. The design can reveal clues about positive users and was not evaluated in deployment.
Summary by alphaXiv.
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