[taler-donau] branch master updated: [protocol doc]: some definitions, receipt request details

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pius-loosli pushed a commit to branch master
in repository donau.

The following commit(s) were added to refs/heads/master by this push:
     new 9fd2ffa  [protocol doc]: some definitions, receipt request details
9fd2ffa is described below

commit 9fd2ffaa864d189296294af5e21cfb62ae08b3ba
Author: Pius Loosli <loosp2@bfh.ch>
AuthorDate: Fri Sep 29 11:43:18 2023 +0200

    [protocol doc]: some definitions, receipt request details
---
 doc/flows/main.tex | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/doc/flows/main.tex b/doc/flows/main.tex
index a65b0cd..3039df4 100644
--- a/doc/flows/main.tex
+++ b/doc/flows/main.tex
@@ -7,18 +7,34 @@
 \usepackage{graphicx}
 
 % Margins
-\usepackage[top=2.5cm, left=3cm, right=3cm, bottom=4.0cm]{geometry}
+\usepackage[top=1.5cm, left=2cm, right=1.5cm, bottom=3.0cm]{geometry}
 % Colour table cells
 \usepackage[table]{xcolor}
 
 \title{DONAU protocol overview}
-\author{Johannes Casaburi \and Pius Losli \and Lukas Matiya}
+\author{Johannes Casaburi \and Pius Loosli \and Lukas Matyja}
 \date{\today}
 
 \begin{document}
 \maketitle
 
 \section{Definitions}
+\begin{itemize}
+    \item $b := $ blinding factor \t d
+    \item $m := $ receipt request \qquad
+    \item $m' :=$ blinded receipt request
+    \item $s :=$ signed receipt
+    \item $s' :=$ blind signed receipt
+\end{itemize}
+
+\section{receipt request}
+The nonce is used to uniquely distinguish receipts of the same value ("create 
a fresh receipt"). Otherwise the donau would refuse receipts starting at the 
second, since it would believe it is a "double spending". To simplify the 
thought process, the nonce can be thought of as "the receipt id".
+\begin{align}
+    m := <Hash(TaxID, salt), \begin{color}{red}{nonce}\end{color}>
+\end{align}
+
+% TODO example
+
 \section{Overview}
 % Insert DONAU overview.png
 \section{Step 1: Donor donates to charity}

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