> Published keys are 16 bytes, one for each day. If moderate numbers of smartphone users are infected in any given week, that's 100s of MBs for all phones to DL.
"Moderate" rate of infections is not millions of new cases per week worldwide. That would be such a catastrophe that contact tracing would be useless.
No, my understanding is you only would download two weeks worth of keys when a new infection is reported. There is an assumption in any method of contact tracing that once people test positive that they are isolating themselves. If they don't, there is no reason to do the tracing since the virus will simply spread exponentially.
> Published keys are 16 bytes, one for each day. If moderate numbers of smartphone users are infected in any given week, that's 100s of MBs for all phones to DL.
"Moderate" rate of infections is not millions of new cases per week worldwide. That would be such a catastrophe that contact tracing would be useless.