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Clarify note slightly.
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LLFourn committed May 29, 2020
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Expand Up @@ -761,8 +761,9 @@ \section{ Proof for Theorem \ref{claim-ecdsa-eufcma}}
$\Ocdh$ oracle we implicitly make the discrete logarithm problem
easy\cite{Kushwaha16} making the reduction from the discrete logarithm
pointless. I am in the process of fixing the proof so that it no longer
requires such a powerful oracle and can be reduced to the static
Diffie-Hellman problem \cite{SDHP}}
requires such a powerful oracle and can be reduced from the discrete logarithm
problem with a static Diffie-Hellman oracle. Technically, this is slightly easier than the
usual discrete logarithm problem but still secure in practice.\cite{SDHP}}

\label{proof-ecdsa-eufcma}
As we have proved, the ECDSA one-time VES is not \EUFCMAVES secure if the CDH problem is hard. We now wish to show that if the CDH problem were easy then it would satisfy \EUFCMAVES i.e.\ leak no useful information to a forger. Thus we give our reduction access to an $\Ocdh$ oracle which when queried with $\Ocdh(X,Y)$ returns $Z$ such that (X,Y,Z) is a Diffie-Hellman tuple with respect to $g$. Additionally, in the reduction we simulate the NIZK $\DLEQ$ proof $\pi$ with $\Sdleq$.
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