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First look at Apple/Google contact tracing framework:

1) Once a day, your device derives a new key ("daily tracing key").

2) It uses that to derive a new "proximity ID" every time your device's bluetooth address changes (15min), which is broadcast to nearby BT sensors.

1/10

— Moxie Marlinspike (@moxie) April 10, 2020

via Twitter https://twitter.com/moxie

April 11, 2020 at 01:49AM