So @Pinboard is probably right that large-scale contact tracing demands well-regulated access to mobile operators and advertising services data. But if we do go the forced-app route, how could it be minimally disclosing? I wrote up a cryptographic outline:https://gist.github.com/colmmacc/740e7db2d9c5836848c849c02f600ec9 …
This scheme uses only boring cryptography (Diffie-Helman ftw) and boring tables. The gist explores the problem space too. I don't think the problem needs mix-networks, homomorphic or zero-knowledge intersection schemes.
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Can you briefly summarize the advantages and disadvantages relative to using the non-gps cell tower location traces police forensics obtain from mobile operators please?
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