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A zero-knowledge proof is a protocol by which the Prover demonstrate to the Verifier that he knows the solution to a given problem, without giving to the Verifier any additional information about the solution -- that is, no information that the Verifier could not already obtain alone. In the case of the discrete logarithm, the y value is not part of what the ...


You are on the right track. However, as Ricky Demer points out in the comments, your suggestion would not work because the input is encrypted with different public keys. To fix this you need to use the properties of the threshold-encryption scheme. In a threshold-encryption scheme the players run a key-generation protocol in order to generate a common ...

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