Zero knowledge may mean:
- Zero-knowledge proof, a concept from cryptography, an interactive method for one party to prove to another that a (usually mathematical) statement is true, without revealing anything other than the veracity of the statement
- Non-interactive zero-knowledge proof, a common random string shared between the prover and the verifier is enough to achieve computational zero-knowledge without requiring interaction
- Zero-knowledge password proof, an interactive method for one party (the prover) to prove to another party (the verifier) that it knows a value of a password
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