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A cryptographic hash algorithm is a function which takes a variable size input and produces a fixed size output. The algorithm makes it difficult to find two inputs with the same output or reconstruct the input from the output.

2 votes
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Is there a way to prove knowledge of a limited resource like a phone number just to the peop...

One possible solution is to have an extremely slow hash (let's say one that takes hour(s) to compute), but this has issues both practically (Bob likely won't bother checking) and theoretically (It's still …
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