[thadt]

> Example applications of the Universal Protocol:

> ...your smartphone can generate a cryptographically secure response to any query about your financial history or health, while keeping your underlying data private and in your own control.

My kids love playing '20 questions'. It's rather remarkable how fast you can go from knowing nothing, to very specific information. With a few answers to 'any query' about your financial history or health, your underlying data will be neither private, nor in your control.

[Vecr]

Yes, this is not statistically well thought out. See Death Note: L, Anonymity & Eluding Entropy (yes it's about a cartoon, but read it for the math).

https://gwern.net/death-note-anonymity

Also see the 2020 census statistical calculations and the tradeoffs they made.

There's "not that many" (compared to the number of ChaCha20 keys, for example) humans in the world, it does not take that many fractional-bit information leaks to get a good read on a person.