Zero-knowledge proof

Zero-knowledge proof is a way for someone (or something) to prove a claim without revealing any information about the claim. For example, you might want to prove that you are old enough to go to a movie, but you don't want to tell anyone how old you actually are. With a zero-knowledge proof, you could prove you're old enough to go to the movie without having to give away your real age. It works by proving something using mathematical facts and reasoning, without revealing the actual information.