I read that Schnorr protocol cannot be proved zero knowledge on that link:

Perfect zero knowledge for the Schnorr protocol? Could any one suggest alternative Zero knowledge proof protocol so a prover can prove to a verifier that he knows the private key corresponding to a particular public key?

  • $\begingroup$ Does the verifier sending a message encrypted with the prover's public key using Elgamal encryption and the prover being able to decrypt the message count? $\endgroup$ – lovesh Feb 1 at 9:13

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