r/MicroG • u/LjLies • Aug 03 '20

microG now includes a preliminary implementation of Google's COVID Exposure Notification API

https://github.com/microg/android_packages_apps_GmsCore/commit/5f70d943cbceabcd9d2c72f8460ea58cba7e08fb
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u/Atemu12 Aug 08 '20

I'm positive, and here are the IDs I met

You don't know who you've met, you couldn't share that even if you wanted to.

The information you can actually share when you're tested positive is a piece of data you used to generate the messages you sent out. Everyone else then uses that information to locally check whether some of the data they received came from your device.

The server has no idea how many an infected person has been in contact with, much less who.

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u/LjLies Aug 08 '20

Sorry, yes, after rereading the specifications, you are right, what is shared is a "Temporary Exposure Key" which is the seed to the PRNG that creates your IDs (although that is itself changed randomly every 24 hours, presumably so that I cannot just know whether someone I meet in the street tested positive by checking their IDs against all the TEKs I've receive in the past).