slides

1 files changed, 32 insertions, 7 deletions

diff --git a/presentation/slides.tex b/presentation/slides.tex
index d52a2d8..5512b71 100644
--- a/presentation/slides.tex
+++ b/presentation/slides.tex
@@ -182,7 +182,7 @@ Income-transparent online e-cash
   \item Consideration of aborts, network failures, refunds, multi-coin
     payments, faults from wallet synchronization and their effects on anonymity;
     showing the practical necessity of a refresh operation.
-  \item
+  \pause
   \item Auditor component: Detection mechanism and responses to
     different compromise scenarios.
   \item Provisions against blackmailing / kidnapping scenarios.
@@ -269,6 +269,14 @@ Byzantine \emph{Set-Union} Consensus
 %----------------------------
 
 \begin{frame}
+\frametitle{How does a payment work?}
+  \begin{enumerate}
+  \end{enumerate}
+\end{frame}
+
+%----------------------------
+
+\begin{frame}
 \frametitle{E-Cash features and trade-offs}
   Some selected aspects (more in thesis)
   \begin{enumerate}[<+- | alert@+>]
@@ -290,6 +298,7 @@ Byzantine \emph{Set-Union} Consensus
         \item Anti-feature, enables black markets / tax evasion!
         \item Taler provides \emph{income transparency}, roughly the \emph{opposite}
       \end{itemize}
+    \item Atomic Swaps / Fair Exchange \uncover<+->{$\Rightarrow$ Supported, coin serial no. is private key}
   \end{enumerate}
 \end{frame}
 
@@ -300,13 +309,19 @@ Byzantine \emph{Set-Union} Consensus
   \begin{itemize}
     \item Existing work: surprisingly little focus on practical use.
       \begin{itemize}
-        \item working out all the details!
+        \item What do customers do \textbf{before} the blind signature protocol?
+        \item How do customers agree to specific contract terms for a transaction?
+        \item How are payments with multiple coins handled?
+        \item How are refunds handled?
+        \item What happens after data loss / aborts / restore from backup?
       \end{itemize}
+    \item Income Transparency (to help detect tax evasion)
     \item Auditor
-      (Technically Obvious, but makes you think about what goes wrong,
-      and \emph{what happens then}.)
-    \item Income Transparency
-    \item Robustness against data loss / restore from backup.
+      \begin{itemize}
+        \item Technically Obvious, but makes you think about what goes wrong,
+          and \emph{what happens then}.
+      \end{itemize}
+    \item Measures against ``perfect crime'' with e-cash
   \end{itemize}
 \end{frame}
 
@@ -316,11 +331,21 @@ Byzantine \emph{Set-Union} Consensus
 A coin that is e.g.
 \begin{itemize}
   \item partially spent, or
-  \item revealed aborted transaction
+  \item revealed in aborted transaction
   \item restored from offline backup
 \end{itemize}
 is \emph{dirty}, and can break anonymity.
 
+\pause
+\vfill
+
+Strawman idea:  Spend coin with exchange, obtain fresh coin
+via blind signing.
+
+$\Rightarrow$ Can be abused:  Merchant provides (blinded) fresh coin to customer
+
+$\Rightarrow$ Naive refresh protocol enables tax evasion
+
 
 \end{frame}