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Zero-knowledge proofs allow one party (the prover) to prove to another party (the verifier) that they know a value, without revealing any information about the value itself. This powerful cryptographic primitive enables privacy-preserving authentication and verification.
Interactive demonstrations of cryptographic protocols that prove knowledge without revealing information
Has secret, generates proof
Generate secret x and public key y = g^x mod p
Verifies proof without learning secret
Animated sequence diagram — messages appear as you progress through the protocol steps
Zero-Knowledge Proofs (ZKP) allow one party (the prover) to prove to another party (the verifier) that a statement is true, without revealing any information beyond the validity of the statement itself.
Think of it like proving you know a password without typing it, or proving you're over 21 without revealing your exact age.
Peggy wants to prove she knows the secret word to open a magic door in a circular cave, without revealing the word to Victor. She enters the cave through one path, Victor doesn't see which. Victor asks her to exit from a specific side. If Peggy knows the secret, she can always comply; if not, she has only 50% chance. After many rounds, Victor is convinced without learning the secret.