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[taler-marketing] branch master updated: prep for BB
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From: |
gnunet |
|
Subject: |
[taler-marketing] branch master updated: prep for BB |
|
Date: |
Thu, 16 Dec 2021 20:51:50 +0100 |
This is an automated email from the git hooks/post-receive script.
grothoff pushed a commit to branch master
in repository marketing.
The following commit(s) were added to refs/heads/master by this push:
new feeda62 prep for BB
feeda62 is described below
commit feeda62b30b1992a61ffd373a6178c9d31fecc90
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Thu Dec 16 20:51:48 2021 +0100
prep for BB
---
presentations/2021-cb/{oenb.tex => bb.tex} | 453 +----------------------------
presentations/2021-cb/oenb.tex | 2 +-
2 files changed, 3 insertions(+), 452 deletions(-)
diff --git a/presentations/2021-cb/oenb.tex b/presentations/2021-cb/bb.tex
similarity index 59%
copy from presentations/2021-cb/oenb.tex
copy to presentations/2021-cb/bb.tex
index 6b95cf1..723a58d 100644
--- a/presentations/2021-cb/oenb.tex
+++ b/presentations/2021-cb/bb.tex
@@ -104,7 +104,7 @@
%\setbeamercovered{transparent=1}
\author[C. Grothoff]{{\bf C. Grothoff}}
-\date{15.10.2021}
+\date{17.12.2021}
\institute{Taler Systems SA}
@@ -534,13 +534,6 @@ But of course we use modern instantiations.
\end{minipage}
\end{frame}
-\begin{frame}{Withdrawing coins on the Web}
- \begin{center}
- \includegraphics[height=0.9\textheight]{figs/taler-withdraw.pdf}
- \end{center}
-\end{frame}
-
-
\begin{frame}{Customer: Build shopping cart}
\begin{center}
\begin{tikzpicture}
@@ -556,38 +549,6 @@ But of course we use modern instantiations.
\end{frame}
-\begin{frame}{Merchant Integration: Payment Request}
-% \begin{figure}[p!]
- \lstset{language=HTML5}
- \lstinputlisting{figs/taler-402.html}
-% \caption{Sample HTTP response to prompt the wallet to show an offer.}
-% \label{listing:http-contract}
-\end{frame}
-
-% \begin{figure*}[p!]
-% \lstset{language=HTML5}
-% \lstinputlisting{figs/taler-contract.html}
-% \caption{Sample JavaScript code to prompt the wallet to show an offer.
-% Here, the contract is fetched on-demand from the server.
-% The {\tt taler\_pay()} function needs to be invoked
-% when the user triggers the checkout.}
-% \label{listing:contract}
-% \end{figure*}
-%\end{frame}
-
-
-%\begin{frame}{Merchant Integration: Contract}
- % \begin{figure*}[t!]
-% {\tiny
-% \lstset{language=JavaScript}
-% \lstinputlisting{figs/taler-contract.json}
-% \caption{Minimal Taler contract over a digital article with a value of
\EUR{0.10}. The merchant will pay transaction fees up to \EUR{0.01}. The hash
over the wire transfer information was truncated to make it fit to the page.}
-% \label{listing:json-contract}
- % \end{figure*}
-% }
-%\end{frame}
-
-
\begin{frame}{Merchant: Propose contract (EdDSA)}
\begin{minipage}{6cm}
\begin{enumerate}
@@ -684,416 +645,6 @@ But of course we use modern instantiations.
\end{frame}
-\begin{frame}{Payment processing with Taler}
- \begin{center}
- \includegraphics[height=0.9\textheight]{figs/taler-pay.pdf}
- \end{center}
-\end{frame}
-
-
-\begin{frame}{Giving change}
- It would be inefficient to pay EUR 100 with 1 cent coins!
- \begin{itemize}
- \item Denomination key represents value of a coin.
- \item Exchange may offer various denominations for coins.
- \item Wallet may not have exact change!
- \item Usability requires ability to pay given sufficient total funds.
- \end{itemize}\pause
- Key goals:
- \begin{itemize}
- \item maintain unlinkability
- \item maintain taxability of transactions
- \end{itemize}\pause
- Method:
- \begin{itemize}
- \item Contract can specify to only pay {\em partial value} of a coin.
- \item Exchange allows wallet to obtain {\em unlinkable change}
- for remaining coin value.
- \end{itemize}
-\end{frame}
-
-
-\begin{frame}{Diffie-Hellman (ECDH)}
- \begin{minipage}{8cm}
- \begin{enumerate}
- \item Create private keys $c,t \mod o$
- \item Define $C = cG$
- \item Define $T = tG$
- \item Compute DH \\ $cT = c(tG) = t(cG) = tC$
- \end{enumerate}
- \end{minipage}
- \begin{minipage}{6cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 2em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (t) [def, draw=none] at (0,0) {$t$};
- \node (ct) [def, draw=none, below left=of
b]{\includegraphics[width=0.2\textwidth]{dh.pdf}};
- \node (c) [def, draw=none, above left= of ct] {$c$};
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (ct) -- (c) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (ct) -- (t) node [midway, above, sloped] (TextNode) {};
- \end{tikzpicture}
- \end{minipage}
-\end{frame}
-
-
-\begin{frame}{Strawman solution}
- \begin{minipage}{8cm}
- Given partially spent private coin key $c_{old}$:
- \begin{enumerate}
-% \item Let $C_{old} := c_{old}G$ (as before)
- \item Pick random $c_{new} \mod o$ private key
- \item $C_{new} = c_{new}G$ public key
- \item Pick random $b_{new}$
- \item Compute $f_{new} := FDH(C_{new})$, $m < n$.
- \item Transmit $f'_{new} := f_{new} b_{new}^e \mod n$
- \end{enumerate}
- ... and sign request for change with $c_{old}$.
- \end{minipage}
- \begin{minipage}{4cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 1.5em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (blinded) [def,
draw=none]{\includegraphics[width=0.15\textwidth]{blinded.pdf}};
- \node (planchet) [def, draw=none, above left= of blinded]
{\includegraphics[width=0.15\textwidth]{planchet.pdf}};
- \node (cnew) [def, draw=none, above= of planchet] {$c_{new}$};
- \node (bnew) [def, draw=none, above right= of blinded] {$b_{new}$};
- \node (dice1) [def, draw=none, above = of
cnew]{\includegraphics[width=0.2\textwidth]{dice.pdf}};
- \node (dice2) [def, draw=none, above = of
bnew]{\includegraphics[width=0.2\textwidth]{dice.pdf}};
- \node (exchange) [node distance=4em and 0.5em, draw, below =of
blinded]{Exchange};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (cnew) -- (dice1) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (planchet) -- (cnew) node [midway, above, sloped] (TextNode)
{};
- \draw [<-, C] (bnew) -- (dice2) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (planchet) node [midway, above, sloped]
(TextNode) {};
- \draw [<-, C] (blinded) -- (bnew) node [midway, above, sloped] (TextNode)
{};
- \draw [<-, C] (exchange) -- (blinded) node [midway, above, sloped]
(TextNode) {{\small transmit}};
- \end{tikzpicture}
- \end{minipage}
- \pause
- \vfill
- {\bf Problem: Owner of $c_{new}$ may differ from owner of $c_{old}$!}
-\end{frame}
-
-
-\begin{frame}{Customer: Transfer key setup (ECDH)}
- \begin{minipage}{8cm}
- Given partially spent private coin key $c_{old}$:
- \begin{enumerate}
- \item Let $C_{old} := c_{old}G$ (as before)
- \item Create random private transfer key $t \mod o$
- \item Compute $T := tG$
- \item Compute $X := c_{old}(tG) = t(c_{old}G) = tC_{old}$
- \item Derive $c_{new}$ and $b_{new}$ from $X$
- \item Compute $C_{new} := c_{new}G$
- \item Compute $f_{new} := FDH(C_{new})$
- \item Transmit $f_{new}' := f_{new} b_{new}^e$
- \end{enumerate}
- \end{minipage}
- \begin{minipage}{4cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 1.5em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (t) [def, draw=none] at (0,0) {$t$};
- \node (dice) [def, draw=none, above = of
t]{\includegraphics[width=0.2\textwidth]{dice.pdf}};
- \node (dh) [def, draw=none, below left=of
b]{\includegraphics[width=0.2\textwidth]{ct.pdf}};
- \node (d) [def, draw=none, above left= of dh] {$c_{old}$};
- \node (cp) [def, draw=none, below left= of dh] {$c_{new}$};
- \node (bp) [def, draw=none, below right= of dh] {$b_{new}$};
- \node (blinded) [def, draw=none, below right=of
cp]{\includegraphics[width=0.15\textwidth]{blinded.pdf}};
- \node (exchange) [node distance=4em and 0.5em, draw, below =of
blinded]{Exchange};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (dh) -- (d) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (t) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (t) -- (dice) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (cp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (bp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (cp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (bp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (exchange) -- (blinded) node [midway, above, sloped]
(TextNode) {{\small transmit}};
- \end{tikzpicture}
- \end{minipage}
-\end{frame}
-
-
-\begin{frame}{Cut-and-Choose}
- \begin{minipage}{4cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 1.5em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (t) [def, draw=none] at (0,0) {$t_1$};
- \node (dice) [def, draw=none, above = of
t]{\includegraphics[width=0.2\textwidth]{dice.pdf}};
- \node (dh) [def, draw=none, below left=of
b]{\includegraphics[width=0.2\textwidth]{ct.pdf}};
- \node (d) [def, draw=none, above left= of dh] {$c_{old}$};
- \node (cp) [def, draw=none, below left= of dh] {$c_{new,1}$};
- \node (bp) [def, draw=none, below right= of dh] {$b_{new,1}$};
- \node (blinded) [def, draw=none, below right=of
cp]{\includegraphics[width=0.15\textwidth]{blinded.pdf}};
- \node (exchange) [node distance=4em and 0.5em, draw, below =of
blinded]{Exchange};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (t) -- (dice) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (d) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (t) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (cp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (bp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (cp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (bp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (exchange) -- (blinded) node [midway, above, sloped]
(TextNode) {{\small transmit}};
- \end{tikzpicture}
- \end{minipage}
- \begin{minipage}{4cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 1.5em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (t) [def, draw=none] at (0,0) {$t_2$};
- \node (dice) [def, draw=none, above = of
t]{\includegraphics[width=0.2\textwidth]{dice.pdf}};
- \node (dh) [def, draw=none, below left=of
b]{\includegraphics[width=0.2\textwidth]{ct.pdf}};
- \node (d) [def, draw=none, above left= of dh] {$c_{old}$};
- \node (cp) [def, draw=none, below left= of dh] {$c_{new,2}$};
- \node (bp) [def, draw=none, below right= of dh] {$b_{new,2}$};
- \node (blinded) [def, draw=none, below right=of
cp]{\includegraphics[width=0.15\textwidth]{blinded.pdf}};
- \node (exchange) [node distance=4em and 0.5em, draw, below =of
blinded]{Exchange};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (t) -- (dice) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (d) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (t) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (cp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (bp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (cp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (bp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (exchange) -- (blinded) node [midway, above, sloped]
(TextNode) {{\small transmit}};
- \end{tikzpicture}
- \end{minipage}
- \begin{minipage}{4cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 1.5em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (t) [def, draw=none] at (0,0) {$t_3$};
- \node (dice) [def, draw=none, above = of
t]{\includegraphics[width=0.2\textwidth]{dice.pdf}};
- \node (dh) [def, draw=none, below left=of
b]{\includegraphics[width=0.2\textwidth]{ct.pdf}};
- \node (d) [def, draw=none, above left= of dh] {$c_{old}$};
- \node (cp) [def, draw=none, below left= of dh] {$c_{new,3}$};
- \node (bp) [def, draw=none, below right= of dh] {$b_{new,3}$};
- \node (blinded) [def, draw=none, below right=of
cp]{\includegraphics[width=0.15\textwidth]{blinded.pdf}};
- \node (exchange) [node distance=4em and 0.5em, draw, below =of
blinded]{Exchange};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (t) -- (dice) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (d) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (t) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (cp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (bp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (cp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (bp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (exchange) -- (blinded) node [midway, above, sloped]
(TextNode) {{\small transmit}};
- \end{tikzpicture}
- \end{minipage}
-\end{frame}
-
-
-\begin{frame}{Exchange: Choose!}
- \begin{center}
- \item Exchange sends back random $\gamma \in \{ 1, 2, 3 \}$ to the
customer.
- \end{center}
-\end{frame}
-
-
-\begin{frame}{Customer: Reveal}
- \begin{enumerate}
- \item If $\gamma = 1$, send $t_2$, $t_3$ to exchange
- \item If $\gamma = 2$, send $t_1$, $t_3$ to exchange
- \item If $\gamma = 3$, send $t_1$, $t_2$ to exchange
- \end{enumerate}
-\end{frame}
-
-
-\begin{frame}{Exchange: Verify ($\gamma = 2$)}
- \begin{minipage}{4cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 1.5em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (h) [def, draw=none] at (0,0) {$t_1$};
- \node (dh) [def, draw=none, below left=of
b]{\includegraphics[width=0.2\textwidth]{ct.pdf}};
- \node (d) [def, draw=none, above left= of dh] {$C_{old}$};
- \node (cp) [def, draw=none, below left= of dh] {$c_{new,1}$};
- \node (bp) [def, draw=none, below right= of dh] {$b_{new,1}$};
- \node (blinded) [def, draw=none, below right=of
cp]{\includegraphics[width=0.15\textwidth]{blinded.pdf}};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (dh) -- (d) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (h) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (cp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (bp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (cp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (bp) node [midway, above, sloped] (TextNode) {};
- \end{tikzpicture}
- \end{minipage}
- \begin{minipage}{4cm}
- \
- \end{minipage}
- \begin{minipage}{4cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 1.5em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (h) [def, draw=none] at (0,0) {$t_3$};
- \node (dh) [def, draw=none, below left=of
b]{\includegraphics[width=0.2\textwidth]{ct.pdf}};
- \node (d) [def, draw=none, above left= of dh] {$C_{old}$};
- \node (cp) [def, draw=none, below left= of dh] {$c_{new,3}$};
- \node (bp) [def, draw=none, below right= of dh] {$b_{new,3}$};
- \node (blinded) [def, draw=none, below right=of
cp]{\includegraphics[width=0.15\textwidth]{blinded.pdf}};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (dh) -- (d) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (h) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (cp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (bp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (cp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (blinded) -- (bp) node [midway, above, sloped] (TextNode) {};
- \end{tikzpicture}
- \end{minipage}
-\end{frame}
-
-
-\begin{frame}{Exchange: Blind sign change (RSA)}
- \begin{minipage}{6cm}
- \begin{enumerate}
- \item Take $f_{new,\gamma}'$.
- \item Compute $s' := f_{new,\gamma}'^d \mod n$.
- \item Send signature $s'$.
- \end{enumerate}
- \end{minipage}
- \begin{minipage}{6cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 2em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (hammer) [def, draw=none] at (0,0)
{\includegraphics[width=0.15\textwidth]{hammer.pdf}};
- \node (signed) [def, draw=none, below left=of
hammer]{\includegraphics[width=0.2\textwidth]{sign.pdf}};
- \node (blinded) [def, draw=none, above left=of
signed]{\includegraphics[width=0.15\textwidth]{blinded.pdf}};
- \node (customer) [node distance=4em and 0.5em, draw, below =of
signed]{Customer};
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (signed) -- (hammer) node [midway, above, sloped] (TextNode)
{};
- \draw [<-, C] (signed) -- (blinded) node [midway, above, sloped]
(TextNode) {};
- \draw [<-, C] (customer) -- (signed) node [midway, above, sloped]
(TextNode) {{\small transmit}};
- \end{tikzpicture}
- \end{minipage}
-\end{frame}
-
-
-\begin{frame}{Customer: Unblind change (RSA)}
- \begin{minipage}{6cm}
- \begin{enumerate}
- \item Receive $s'$.
- \item Compute $s := s' b_{new,\gamma}^{-1} \mod n$.
- \end{enumerate}
- \end{minipage}
- \begin{minipage}{6cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 2em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (b) [def, draw=none] at (0,0) {$b_{new,\gamma}$};
- \node (coin) [def, draw=none, below left=of
b]{\includegraphics[width=0.2\textwidth]{coin.pdf}};
- \node (signed) [def, draw=none, above left=of
coin]{\includegraphics[width=0.15\textwidth]{sign.pdf}};
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (coin) -- (b) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (coin) -- (signed) node [midway, above, sloped] (TextNode)
{};
- \end{tikzpicture}
- \end{minipage}
-\end{frame}
-
-
-\begin{frame}{Exchange: Allow linking change}
- \begin{minipage}{7cm}
- \begin{center}
- Given $C_{old}$
-
- \vspace{1cm}
-
- return $T_\gamma$, $s := s' b_{new,\gamma}^{-1} \mod n$.
- \end{center}
- \end{minipage}
- \begin{minipage}{5cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 3em and 0.5em, inner sep=0.5em, outer
sep=.3em];
- \node (co) [def, draw=none] at (0,0) {$C_{old}$};
- \node (T) [def, draw=none, below left=of co]{$T_\gamma$};
- \node (sign) [def, draw=none, below right=of
co]{\includegraphics[width=0.15\textwidth]{sign.pdf}};
- \node (customer) [def, draw, below right=of T] {Customer};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (T) -- (co) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (sign) -- (co) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (customer) -- (T) node [midway, above, sloped] (TextNode)
{link};
- \draw [<-, C] (customer) -- (sign) node [midway, above, sloped] (TextNode)
{link};
- \end{tikzpicture}
- \end{minipage}
-\end{frame}
-
-
-\begin{frame}{Customer: Link (threat!)}
- \begin{minipage}{6.3cm}
- \begin{enumerate}
- \item Have $c_{old}$.
- \item Obtain $T_\gamma$, $s$ from exchange
- \item Compute $X_\gamma = c_{old}T_\gamma$
- \item Derive $c_{new,\gamma}$ and $b_{new,\gamma}$ from $X_\gamma$
- \item Unblind $s := s' b_{new,\gamma}^{-1} \mod n$
- \end{enumerate}
-
- \end{minipage}
- \begin{minipage}{5.7cm}
- \begin{tikzpicture}
- \tikzstyle{def} = [node distance= 1.5em and 0.5em, inner sep=0em, outer
sep=.3em];
- \node (T) [def, draw=none] at (0,0) {$T_\gamma$};
- \node (exchange) [def, inner sep=0.5em, draw, above left=of T] {Exchange};
- \node (signed) [def, draw=none, below left=of
T]{\includegraphics[width=0.15\textwidth]{sign.pdf}};
- \node (dh) [def, draw=none, below right=of
T]{\includegraphics[width=0.2\textwidth]{ct.pdf}};
- \node (bp) [def, draw=none, below left= of dh] {$b_{new,\gamma}$};
- \node (co) [def, draw=none, above right= of dh] {$c_{old}$};
- \node (cp) [def, draw=none, below= of dh] {$c_{new,\gamma}$};
- \node (coin) [def, draw=none, below left = of
bp]{\includegraphics[width=0.2\textwidth]{coin.pdf}};
- \node (psign) [def, node distance=2.5em and 0em, draw=none, below = of
cp]{\includegraphics[width=0.2\textwidth]{planchet-sign.pdf}};
-
- \tikzstyle{C} = [color=black, line width=1pt]
-
- \draw [<-, C] (dh) -- (co) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (dh) -- (T) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (cp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (bp) -- (dh) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (coin) -- (signed) node [midway, above, sloped] (TextNode)
{};
- \draw [<-, C] (coin) -- (bp) node [midway, above, sloped] (TextNode) {};
- \draw [<-, C] (T) -- (exchange) node [midway, above, sloped] (TextNode)
{link};
- \draw [<-, C] (signed) -- (exchange) node [midway, below, sloped]
(TextNode) {link};
- \draw [<-, C, double] (psign) -- (cp) node [midway, below, sloped]
(TextNode) {};
- \end{tikzpicture}
- \end{minipage}
-\end{frame}
-
-
-\begin{frame}{Refresh protocol summary}
- \begin{itemize}
- \item Customer asks exchange to convert old coin to new coin
- \item Protocol ensures new coins can be recovered from old coin
- \item[$\Rightarrow$] New coins are owned by the same entity!
- \end{itemize}
- Thus, the refresh protocol allows:
- \begin{itemize}
- \item To give unlinkable change.
- \item To give refunds to an anonymous customer.
- \item To expire old keys and migrate coins to new ones.
- \item To handle protocol aborts.
- \end{itemize}
- \noindent
- \begin{center}
- \bf
- Transactions via refresh are equivalent to {\em sharing} a wallet.
-\end{center}
-\end{frame}
-
-
\begin{frame}{Scalability}
On paper, the design scales linearly with computing resources:
\begin{itemize}
@@ -1119,7 +670,7 @@ On a {\bf single desktop system}, we measured:
\item {\bf 33k+} transactions aggregated/second
\item {\bf 62k+} export outbound wire transfers per second (to RTGS)
\end{itemize}
-We are now configuring the Grid5000 for larger-scale experiments.
+We are now configuring the Grid 5000 for larger-scale experiments.
\end{frame}
diff --git a/presentations/2021-cb/oenb.tex b/presentations/2021-cb/oenb.tex
index 6b95cf1..7b686f7 100644
--- a/presentations/2021-cb/oenb.tex
+++ b/presentations/2021-cb/oenb.tex
@@ -104,7 +104,7 @@
%\setbeamercovered{transparent=1}
\author[C. Grothoff]{{\bf C. Grothoff}}
-\date{15.10.2021}
+\date{17.12.2021}
\institute{Taler Systems SA}
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