From a look at the Cryptography paper, this looks basically the same as #DP3T design one, though with the anonimity benefit of rotating Mac addresses and ephemeral IDs at the same time. It's a good set of trade-offs.https://www.apple.com/newsroom/2020/04/apple-and-google-partner-on-covid-19-contact-tracing-technology/ …
Yep, it's also a hard attack to mitigate. Even you add some kind of active authentication, a bi-directional replay would defeat that too. Just like those amplifier attacks on wireless car fobs.
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#Bluetrace is resistant to one directional rebroadcast attacks b/c it saves EphID pairs on both sender and receiver. Traffic analysis can mitigate bi-directional.https://twitter.com/ristad/status/1249045352625442818 …Thanks. Twitter will use this to make your timeline better. UndoUndo
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