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Updated paper to solve NRP vulnerability #26

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Nov 28, 2023
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Updated paper to solve NRP vulnerability #26

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8 changes: 6 additions & 2 deletions specs/anoncreds1/anoncreds.tex
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Expand Up @@ -603,11 +603,11 @@ \subsubsection{Final preparation}\label{sec:final}
\widehat{o} &\leftarrow \widetilde{o} - c_H\cdot o\bmod{q}\\
\widehat{c} &\leftarrow \widetilde{c} - c_H\cdot c\bmod{q} &
\widehat{o'} &\leftarrow \widetilde{o'} - c_H\cdot o'\bmod{q}\\
\widehat{m} &\leftarrow \widetilde{m} - c_H m\bmod{q} &
\widehat{m} &\leftarrow \widetilde{m} + c_H m\bmod{q} &
\widehat{m'} &\leftarrow \widetilde{m'} - c_H m'\bmod{q}\\
\widehat{t} &\leftarrow \widetilde{t} - c_H t\bmod{q} &
\widehat{t'} &\leftarrow \widetilde{t'} - c_H t'\bmod{q}\\
\widehat{m_2} &\leftarrow \widetilde{m_2} - c_H m_2\bmod{q} &
\widehat{m_2} &\leftarrow \widetilde{m_2} + c_H m_2\bmod{q} &
\widehat{s} &\leftarrow \widetilde{s} - c_H s\bmod{q}\\
\widehat{r} &\leftarrow \widetilde{r} - c_H r\bmod{q} &
\widehat{r'} &\leftarrow \widetilde{r'} - c_H r'\bmod{q}\\
Expand Down Expand Up @@ -755,4 +755,8 @@ \subsubsection{Final hashing}\label{sec:finalhash}
\item Proof of correctness for issuer's signature: steps 2.2.1, 2.2.2, 2.2.3.
\item Verification of correctness of signature: steps 3.1.0, 3.1.1, 3.1.2, 3.2.0, 3.2.1.
\end{itemize}
\subsection{15 Nov 2023}
\begin{itemize}
\item Changed $\hat{m} \leftarrow \tilde{m} - c_H$ to $\hat{m} \leftarrow \tilde{m} + c_H$, and $\hat{m_2} \leftarrow \tilde{m_2} - c_H$ to $\hat{m_2} \leftarrow \tilde{m_2} + c_H$ in section 7.2.2.1, to fix possible revocation mix and match attack.
\end{itemize}
}{}
4 changes: 2 additions & 2 deletions specs/anoncreds1/anoncredsmain.tex
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Expand Up @@ -13,8 +13,8 @@
\newcommand{\fullpaper}{}

\title{Anonymous credentials with type-3 revocation}
\author{Dmitry Khovratovich, Michael Lodder, Cam Parra}
\date{25 April 2022, version 0.6}
\author{Dmitry Khovratovich, Michael Lodder, Cam Parra, Aritra Bhaduri}
\date{15 November 2023, version 0.7}

\begin{document}

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