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Just thought of another ZKP - my niece can prove to me that she knows the password to a device by logging in, without me ever knowing the password myself.
by hackathonguy 8y ago
Just thought of another ZKP - my niece can prove to me that she knows the password to a device by logging in, without me ever knowing the password myself.
- Bromskloss 8y agoHow does she do that?!
- throwawaymath 8y agoTechnically speaking that's not a zero knowledge proof, because it requires what would be considered a trusted third party (the service being logged into). Ostensibly that service "knows" the password (or a functional substitute), and the prover is only proving password possession insofar as the third party service can be trusted. In your Where's Waldo example, this would be like having a non-playing third participant whose trusted by both players. When one player wishes to prove they've found Waldo without ending the game for the other play, they'd demonstrate this in full transparency to the third party verifier, whose word would then be trusted by the second player.
- alexeldeib 8y agoIsn’t this very similar to the classical magic word door example, assuming the password is stored as some hashed value? E; not really