Privacy-Preserving Proximity Tracing — well done #PbD

I am impressed by @PeppPt Privacy-Preserving Proximity Tracing for use in situations like #COVID19 -- Impressive #PbD Privacy by Design. Their detailed design document with Privacy Considerations, and Security Considerations is available here. The use-case they are addressing is discovering who someone has been close to, when later that individual is found to be positive COVID-19 infected; while maintaining everyone's privacy.Their documentation shows good design thinking and transparency of risks, mitigation, and residual. It shows that when one includes Privacy-By-Design...