diff --git a/age-restriction.drawio/.$age-restriction-taler.drawio.bkp b/age-restriction.drawio/.$age-restriction-taler.drawio.bkp
new file mode 100644
index 0000000..fbb486f
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diff --git a/age-restriction.drawio/age-restriction-taler.drawio b/age-restriction.drawio/age-restriction-taler.drawio
index 5c78f62..7e540b8 100644
--- a/age-restriction.drawio/age-restriction-taler.drawio
+++ b/age-restriction.drawio/age-restriction-taler.drawio
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diff --git a/eipsi2024/eipsi2024.tex b/eipsi2024/eipsi2024.tex
index 919809f..00d73e9 100644
--- a/eipsi2024/eipsi2024.tex
+++ b/eipsi2024/eipsi2024.tex
@@ -101,12 +101,11 @@
\item<1->[Deliverable]~\\
Present a solution to age restriction and its integration in GNU Taler.
\vfill
- \item<2->[Side-Channel]~\\
+ \item<2->[Drive-By]~\\
Show concepts from cryptography by example:
Zero-Knowledge protocol, Security Game and Security Proof
- This will be technical.
\vfill
\item<3->[Non-goals]~\\
\begin{itemize}
@@ -119,13 +118,15 @@
\begin{frame}{Sponsors}
\centering\begin{columns}[T]
- \column{0.5\textwidth}
- \centering NGI Pointer program of the European Commission\\[2em]
+ \column{0.6\textwidth}
+ \centering NGI Taler and NGI Pointer programs of the European Commission\\[2em]
- \centering\includegraphics[width=0.7\textwidth]{images/ngi-ap3.png}
+ \centering\includegraphics[width=0.9\textwidth]{images/ngi-taler.jpg}
- \column{0.5\textwidth}
- \centering Project \textit{Concrete Contracts} in the
+ \centering\includegraphics[width=0.5\textwidth]{images/ngi-ap3.png}
+
+ \column{0.4\textwidth}
+ \centering Project\\ \textit{Concrete Contracts} in the
\textit{KMU-innovativ} programm\\[2em]
\centering\includegraphics[width=0.9\textwidth]{images/bmbf-english.jpg}
@@ -297,6 +298,43 @@ with the following properties:
\end{columns}
\end{frame}
+\begin{frame}{Helpful figure - Commit}
+
+ \centering\includegraphics[height=0.9\textheight]{images/commit.pdf}
+
+\end{frame}
+
+\begin{frame}{Helpful figure - Attest and Verify}
+
+ \centering\includegraphics[height=0.9\textheight]{images/attest-verify.pdf}
+
+\end{frame}
+
+\begin{frame}{Helpful figure - Derive and Compare}
+
+ \centering\includegraphics[width=\textwidth]{images/derive-compare.pdf}
+
+\end{frame}
+
+\begin{frame}{Helpful figure}
+ \small
+ \begin{columns}[t]
+ \column{0.25\textwidth}
+ Commit:\\[1em]
+
+ \includegraphics[width=\textwidth]{images/commit.pdf}
+
+ \column{0.25\textwidth}
+ Attest and Verify:\\[1em]
+
+ \includegraphics[width=\textwidth]{images/attest-verify.pdf}
+
+ \column{0.5\textwidth}
+ Derive and Compare:\\[1em]
+
+ \includegraphics[width=\textwidth]{images/derive-compare.pdf}
+ \end{columns}
+\end{frame}
\begin{frame}{Specification of the Function Signatures}
\small
@@ -362,6 +400,7 @@ Searching for functions \uncover<2->{with the following signatures}
}
\end{frame}
+
\begin{frame}{Naïve scheme}
\begin{center}
\begin{tikzpicture}[scale=.8]
@@ -427,39 +466,57 @@ Searching for functions \uncover<2->{with the following signatures}
\end{frame}
\begin{frame}{Achieving Unlinkability}
- Given $\Derive()$ and $\Compare()$, define the Zero-Knowledge-protocol
+ Given $\Derive()$ and $\Compare()$, define the cut-and-choose protocoll
\orange{$\DeriveCompare$} as follows (sketch):
+ \begin{columns}
+ \column{0.3\textwidth}
+ \pause
+ \includegraphics[width=\textwidth]{images/cut-and-choose.pdf}
+
+ \column{0.7\textwidth}
+ \pause
+
\uncover<2->{
- \small
+
+ \scriptsize
+
Let $\kappa \in \N$ (say: $\kappa = 3$)
\begin{itemize}[<+->]
\item[$\Child$:]
\begin{enumerate}
+ \scriptsize
\item generates $(\commitment_1,\dots,\commitment_\kappa)$
- and $(\beta_1,\dots,\beta_\kappa)$ from $\commitment_0$\\
+ and $(\beta_1,\dots,\beta_\kappa)$ from $\commitment_0$
by calling $\kappa$ times $\Derive(\commitment_0, \pruf_0, \omega_i)$
\item calculates $h_0:=H\left(H(\commitment_1, \beta_1)\parallel \dots\parallel H(\commitment_\kappa, \beta_\kappa)\right)$
\item sends $\commitment_0$ and $h_0$ to $\Exchange$
\end{enumerate}
\item[$\Exchange$:]
\begin{enumerate}
+ \scriptsize
+
\item[4.] saves $\commitment_0$ and $h_0$ and sends $\Child$ random $\gamma \in \{1,\dots,\kappa\}$
\end{enumerate}
\item[$\Child$:]
\begin{enumerate}
+ \scriptsize
\item[5.] reveals $h_\gamma:=H(\commitment_\gamma, \beta_\gamma)$ and all $(\commitment_i, \beta_i)$, except $(\commitment_\gamma, \beta_\gamma)$
\end{enumerate}
\item[$\Exchange$:]
\begin{enumerate}
- \item[6.] compares $h_0$ and
+ \scriptsize
+ \item[6.] compares $h_0$ and
$H\left(H(\commitment_1, \beta_1)\parallel ...\parallel h_\gamma\parallel ...\parallel H(\commitment_\kappa, \beta_\kappa)\right)$
\item[7.] evaluates $\Compare(\commitment_0, \commitment_i, \beta_i)$ for all $i \neq \gamma$.
\end{enumerate}
\end{itemize}
\pause
+ \scriptsize
+
If all steps succeed, $\commitment_\gamma$ is the new commitment.
}
+ \end{columns}
\end{frame}
\begin{frame}{Achieving Unlinkability}%{Certainty trade-off}
@@ -677,10 +734,15 @@ Searching for functions \uncover<2->{with the following signatures}
\end{frame}
\begin{frame}{Definition of Commit with ECDSA}%{Definition of Commit}
-
+ \begin{columns}
+ \column{0.2\textwidth}
+ \includegraphics[width=1.1\textwidth]{images/commit.pdf}
+ \column{0.8\textwidth}
\begin{description}
+ \small
\item[To \blue{Commit} to age group $\age \in \{1,\dots,\Age\}$]~\\
\begin{enumerate}[<+->]
+ \small
\item Guardian generates ECDSA-keypairs, one per age group:
\[\langle(q_1, p_1),\dots,(q_\Age,p_\Age)\rangle\]
\item Guardian then \textbf{drops} all private keys
@@ -699,15 +761,23 @@ Searching for functions \uncover<2->{with the following signatures}
\vfill
\end{enumerate}
\end{description}
+ \end{columns}
\end{frame}
\begin{frame}{Attest and Verify with ECDSA}
+ \begin{columns}
+ \column{0.2\textwidth}
+ \includegraphics[width=1.1\textwidth]{images/attest-verify.pdf}
+ \column{0.8\textwidth}
+ \small
Child has
\begin{itemize}
+ \small
\item ordered public-keys $\Vcommitment = (q_1, \dots~\dots~\dots, q_\Age) $,
\item (some) private-keys $\Vpruf = (p_1, \dots, p_\age, \Nil, \dots, \Nil)$.
\end{itemize}
\begin{description}
+ \small
\item<2->[To \blue{Attest} a minimum age (group) $\blue{\minage} \leq \age$:]~\\
Sign a message with ECDSA using private key
$p_\blue{\minage}$. The signature $\sigma_\blue{\minage}$ is the
@@ -717,17 +787,21 @@ Searching for functions \uncover<2->{with the following signatures}
\vfill
\uncover<3->{
+ \small
Merchant gets
\begin{itemize}
+ \small
\item ordered public-keys $\Vcommitment = (q_1, \dots, q_\Age) $
\item Signature $\sigma_\blue{\minage}$
\end{itemize}
\begin{description}
+ \small
\item<4->[To \blue{Verify} a minimum age (group) \blue{$\minage$}:]~\\
Verify the ECDSA-Signature $\sigma_\blue{\minage}$ with public key $q_\blue{\minage}$.
\end{description}
}
\vfill
+ \end{columns}
\end{frame}
\begin{frame}{Derive and Compare with ECDSA}
@@ -951,57 +1025,65 @@ Searching for functions \uncover<2->{with the following signatures}
\centering \includegraphics[height=0.9\textheight]{images/wallet-age.png}
\end{frame}
-\include{gnu}
-
-\begin{frame}{Interested in GNU Taler?}
- We are looking for developers, testers, users!
-
- \begin{description}
- \item[Intro:] \url{https://taler.net}
- \item[Learn:] \url{https://docs.taler.net}
- \item[Develop:] \url{https://git.taler.net}, \url{https://bugs.taler.net}
- \end{description}
-\end{frame}
+% \include{gnu}
+%
+% \begin{frame}{Interested in GNU Taler?}
+% We are looking for developers, testers, users!
+%
+% \begin{description}
+% \item[Intro:] \url{https://taler.net}
+% \item[Learn:] \url{https://docs.taler.net}
+% \item[Develop:] \url{https://git.taler.net}, \url{https://bugs.taler.net}
+% \end{description}
+% \end{frame}
\section{Discussion \& Conclusion}
\begin{frame}{Discussion}
+ Technical Aspects and Challenges
\begin{itemize}[<+->]
\item Our solution can in principle be used with any token-based payment scheme
\item[] However, GNU Taler best aligned with our design goals
(security, privacy and efficiency).
\item Subsidiarity requires bank accounts being owned by adults.
- \item[] However, scheme can be adapted to cases of
+ \item[] However, scheme can be adapted
\begin{itemize}
- \item minors have bank accounts
- \item peer-to-peer payments
- \item[] Hint: Know-Your-Customer (KYC) and adapted
- withdraw protocol.
+ \item Know-Your-Customer (KYC) provides age information
+ \item Parents can set age on a long-term wallet of a child
+ \item cut\&choose protocol \texttt{age-withdraw} implemented
\end{itemize}
- \item Our scheme offers an alternative to identity management systems (IMS)
\end{itemize}
\end{frame}
-% \begin{frame}{Related Work}
-% \begin{itemize}
-% \item Current privacy-perserving systems all based on
-% attribute-based credentials (Koning et al.,
-% Schanzenbach et al., Camenisch et al., Au et al.)
-%
-% \item Attribute-based approach lacks support:
-% \begin{itemize}
-% \item Complex for consumers and retailers
-% \item Requires trusted third authority
-% \end{itemize}
-% \vfill
-% \item Other approaches tie age-restriction to ability to pay ("debit cards for kids")
-% \begin{itemize}
-% \item Advantage: mandatory to payment process
-% \item Not privacy friendly
-% \end{itemize}
-% \end{itemize}
-% \end{frame}
+\begin{frame}{Discussion}
+ Legal aspects and applicability
+ \begin{itemize}[<+->]
+ \item The scheme only makes sense when cheating can be discouraged, f.e. economically
+ \item There will be limits where the scheme is considered acceptable.
+ \item Our scheme offers an alternative to identity management systems (IMS), where applicable
+ \end{itemize}
+\end{frame}
+
+\begin{frame}{Related Work}
+ \begin{itemize}
+ \item Current privacy-perserving systems all based on
+ attribute-based credentials (Koning et al.,
+ Schanzenbach et al., Camenisch et al., Au et al.)
+
+ \item Attribute-based approach lacks support:
+ \begin{itemize}
+ \item Complex for consumers and retailers
+ \item Requires trusted third authority
+ \end{itemize}
+ \vfill
+ \item Other approaches tie age-restriction to ability to pay ("debit cards for kids")
+ \begin{itemize}
+ \item Advantage: mandatory to payment process
+ \item Not privacy friendly
+ \end{itemize}
+ \end{itemize}
+\end{frame}
\begin{frame}{Conclusion}
Age restriction is a technical, ethical and legal challenge.
@@ -1015,7 +1097,7 @@ Searching for functions \uncover<2->{with the following signatures}
\vfill
\pause
- Our scheme offers a solution that
+ Our scheme offers an option that
\begin{itemize}
\item aligns with subsidiarity
\item preserves privacy
@@ -1026,7 +1108,7 @@ Searching for functions \uncover<2->{with the following signatures}
\begin{frame}{}
- \large
+ % \large
\begin{center}
{\Huge \textbf{Thank you!}}\\
Questions?
@@ -1038,9 +1120,11 @@ Searching for functions \uncover<2->{with the following signatures}
\vfill
{Interested in GNU Taler?}
\begin{description}
- \item[Intro:] \url{https://taler.net}
+ \item[Intro:] \url{https://taler.net},
\item[Learn:] \url{https://docs.taler.net}
\item[Develop:] \url{https://git.taler.net}, \url{https://bugs.taler.net}
+ \item[Connect:] \url{https://ich.taler.net}
+ \item[NGI Taler:] \url{https://ngi.taler.net}
\end{description}
\end{center}
\end{frame}
diff --git a/eipsi2024/images/attest.jpg b/eipsi2024/images/attest.jpg
new file mode 100644
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diff --git a/eipsi2024/images/attest.svg b/eipsi2024/images/attest.svg
new file mode 100644
index 0000000..f1404f9
--- /dev/null
+++ b/eipsi2024/images/attest.svg
@@ -0,0 +1,4 @@
+
+
+
+
\ No newline at end of file
diff --git a/eipsi2024/images/commit.jpg b/eipsi2024/images/commit.jpg
new file mode 100644
index 0000000..028b07c
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new file mode 100644
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diff --git a/eipsi2024/images/commit.svg b/eipsi2024/images/commit.svg
new file mode 100644
index 0000000..5281448
--- /dev/null
+++ b/eipsi2024/images/commit.svg
@@ -0,0 +1,4 @@
+
+
+
+
\ No newline at end of file
diff --git a/eipsi2024/images/commit.vsdx b/eipsi2024/images/commit.vsdx
new file mode 100644
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