I feel like the crypto in the COVID tracing apps is so simple that it doesn’t need much explanation. But I also see plenty of people nervous about the privacy these things provide. Is it worth explaining?
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Because things are derived deterministically by time, the app can fetch a filter, or a set of exact infected ids (whichever is smaller), that covers the time periods it knows it had contacts. And then see if there are any matches.
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Yes, but some people might consider fetching IDs by time a bug, not a feature. It allows Alice to know that Bob was infected because they met alone 3PM yesterday.
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