Other people already linked the wikipedia article, but basically the thing it allows for is verification of a key without trust of it and provides effective pro

Other people already linked the wikipedia article, but basically the thing it allows for is verification of a key without trust of it and provides effective proof you're not being MITM'd. I can ask a question or a series of questions to my friend and we can use zero knowledge proofs to determine we're talking about the same answer to verify his key without disclosing anything about that answer.