donau

commit be91fa9a5bd9385b862e0e36b4b4f789b5a5a7af
parent 49df07a4fd09df2c41e376e7d68c46f2b3c9148c
Author: Matyja Lukas Adam <lukas.matyja@students.bfh.ch>
Date:   Thu, 20 Jun 2024 01:30:32 +0200

add some crypto

Diffstat:
M
doc/presentation/donau_presentation.pdf
 | 
0

M
doc/presentation/donau_presentation.tex
 | 
35
+++++++++++++++++++++++++++++++++--

2 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/doc/presentation/donau_presentation.pdf b/doc/presentation/donau_presentation.pdf
Binary files differ.
diff --git a/doc/presentation/donau_presentation.tex b/doc/presentation/donau_presentation.tex
@@ -217,6 +217,34 @@
 \end{frame}
 %%%---------------------------------------
 \begin{frame}\frametitle{Issue Donation Receipts}
+%TODO: visualize multiple envelopes
+  \begin{tikzpicture}
+    \node (image) at (0,0) {\includegraphics[width=0.1\textwidth]{stickman}};
+    \draw [-latex] (1,0) -- (4,0);
+    \node (image) at (2,0.5) {\includegraphics[width=0.08\textwidth]{letter}};
+    \node at (2,0.5) {\Large{5}};
+    \node (image) at (3.2,0.4) {\includegraphics[width=0.05\textwidth]{coins}};
+    \node (image) at (5.3,0) {\includegraphics[width=0.15\textwidth]{charity}};
+    \draw [-latex] (6.5,0) -- (9.5,0);
+    \node (image) at (8,0.5) {\includegraphics[width=0.08\textwidth]{letter}};
+    \node (image) at (8,0.5) {\includegraphics[width=0.05\textwidth]{blue_wax}};
+    \node at (8,0.5) {\Large{5}};
+    \node (image) at (11,0) {
+    \includegraphics[width=0.12\textwidth]{servers}};
+    \node at (11,-1.2) {Donau};
+  \end{tikzpicture} \vspace{0.4cm}
+  \begin{itemize}
+    \item Donation units (DU) keys representing the value.
+    \item The blinded donation receipt templates contain all the same besides the random nonce and the donation unit.
+    \begin{align*}
+         BUDI :=  blinded(H(\texttt{taxid, salt}), nonce)
+    \end{align*}
+    \item The charity signs with an EdDSA key.
+  \end{itemize}
+\end{frame}
+%%%---------------------------------------
+\begin{frame}\frametitle{Issue Donation Receipts}
+%TODO: visualize multiple signatures without envelopes
   \begin{tikzpicture}
     \node (image) at (0,0) {\includegraphics[width=0.1\textwidth]{stickman}};
     \draw [-latex] (4,0) -- (1,0);
@@ -233,8 +261,8 @@
     \node at (11,-1.2) {Donau};
   \end{tikzpicture} \vspace{0.4cm}
   \begin{itemize}
-    \item Donau creates the donation receipt by blindly signing the donation receipt template.
-    \item Donau sends the blind signature via charity back to the donor.
+    \item Donau creates the donation receipts by blindly signing the donation receipt templates.
+    \item Donau sends the blind signatures via charity back to the donor.
   \end{itemize}
 \end{frame}
 \note{
@@ -272,6 +300,9 @@ Show Donau overview.
   \end{tikzpicture}\vspace{0.4cm}
   \begin{itemize}
     \item The donor submits the signed donation receipts once a year.
+    \begin{align*}
+      donation\ receipt &= \langle H(\texttt{taxid, salt}), nonce, signature, DU) \rangle
+    \end{align*}
     \item Donau automatically checks the donation receipts and summarizes them to a donation statement. This and the sum of all donation receipts submitted are sent back.
   \end{itemize}
 \end{frame}