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signal does some hash-based matching of your contacts without storing your contacts

(but also re 'whole point', not sure about split btwn people who want their own genetic profile vs searching for long-lost twin)

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In order to use DNA tests in genealogy, you need to know every segment on every chromosome that matches. Matching is not a go/nogo proposition. There are degrees of matching that depend on the biological relationship. Ex: Parent/children average 3,700 cM (centiMorgans), siblings are 2,600 cM, first cousins 900 cM etc.

See: https://whoareyoumadeof.com/blog/need-a-dna-centimorgan-char...

You can do holomorphic encryption.

The DNA date needs to be readable by third-party apps, if the user so wishes.

Yes, and that can be done with homomorphic encryption? I don't understand your objection.

Data

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