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https://arxiv.org/pdf/2003.14412v2.pdf
Our long-term plan is #4 in this paper:
https://github.com/PrivateKit/PrivacyDocuments/blob/master/GpsEncryption.pdf
8 April Wired article discussing Safe Paths Privacy algorithms.
https://www.wired.com/story/covid-19-contact-tracing-apps-cryptography/
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