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A zero-knowledge proof is a method used in cryptography that allows one party (the prover) to convince another party (the verifier) that they know a certain piece of information (often a secret, such as a password or cryptographic key) without revealing the actual information itself. The key characteristics of a zero-knowledge proof include: 1. **Completeness**: If the statement is true and both parties follow the protocol correctly, the verifier will be convinced of this fact.