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Zero-knowledge proofs are an interactive method for one party to prove to another that a statement is true, without revealing anything other than the veracity of the statement.
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Fiat-Shamir zero knowledge protocol
In Fiat-Shamir protocol, the final calculation is
$$y^2=x\,v^c$$
Where $c$ is the random $\{1,0\}$, $x$ is the witness and $v$ is the public key $s^2 \bmod n$.
My questions are:
What stops the a …