The updated Apple | Google COVID-19 exposure notification cryptography paper is here: https://covid19-static.cdn-apple.com/applications/covid19/current/static/contact-tracing/pdf/ExposureNotification-CryptographySpecificationv1.1.pdf … . Going to follow up with observations as I read it.
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On the whole, it looks ok to me if a bit precarious. If the Bluetooth MAC address changes and the key-rotations get out of phase, things go bad. If the app re-generates an ID when the power level changes, that's worse, though not the end of the world.
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This all reads like a well-integrated effort by professionals working across cryptographic, radio, and epidemiological boundaries to make smart trade-offs.
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Addendum: maybe the power theory isn't so silly. I forgot that the app also has to re-generate the IDs of every infected person to determine matches. AES will save a lot of power in that case.
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End of conversation
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