[Cryptography] The UK tracing app

[Phillip Hallam-Baker]

They are not using the Google/Apple scheme.

The paper goes into much more detail on the topic of preventing abuse. The
crypto is completely different but still relatively conventional.

It appears to provide more contact tracing capability, not sure what the
privacy tradeoff is at this point.

https://www.ncsc.gov.uk/files/NHS-app-security-paper%20V0.1.pdf?fbclid=IwAR3rYG1LTcMG8zUaHe-f_Mrd-4pm0UEJnahFaW4XP-hVeuNDdn1AgH3mnys
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