5 files changed, 210 insertions, 0 deletions
diff --git a/doc/cs/ads/abbreviation.tex b/doc/cs/ads/abbreviation.tex
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+%!TEX root = ../dokumentation.tex
+\chapter*{Abbreviations}
+\begin{acronym}[YTMMM]
+    \acro{AES}{Advanced Encryption Standard}
+    \acro{AML}{Anti Money Laundering}
+    \acro{API}{Application Programming Interface}
+    \acrodefplural{API}[APIs]{Application Programming Interfaces}
+    \acro{BIP}{Bitcoin Improvement Proposal}
+    \acro{CA}{Certificate Authority}
+    \acro{CDH}{Computational Diffie-Hellman}
+    \acro{CFT}{Combating Financing of Terrorism}
+    \acro{CMA}{Choosen-Message Attack}
+    \acro{CS}{Clause Blind Schnorr Signature Scheme}
+    \acro{CSRF}{Client-Side Request Forgery}
+    \acro{CWE}{Common Weakness Enumeration}
+    \acro{DDH}{Decisional Diffie-Hellman}
+    \acro{DHKE}{Diffie-Hellman key exchange}
+    \acro{DLP}{Discrete Logarithm Problem}
+    \acro{DSA}{Digital Signature Algorithm}
+    \acro{ECC}{Elliptic Curve Cryptography}
+    \acro{ECDH}{Elliptic Curve Diffie Hellman}
+    \acro{EdDSA}{Edwards-curve Digital Signature Algorithm}
+    \acro{EUF}{Existentially Unforgeability}
+    \acro{FDH}{Full-Domain Hash}
+    \acro{GNU AGPL}{GNU Affero General Public License}
+    \acro{GNU GPL}{GNU General Public License}
+    \acro{GNU LGPL}{GNU Lesser General Public License}
+    \acro{IPC}{Inter Process Communication}
+    \acro{JSON}{JavaScript Object Notation}
+    \acro{KDF}{Key Derivation Function}
+    \acro{KYC}{Know Your Customer}
+    \acro{MAC}{Message Authentication Code}
+    \acro{NIST}{National Institute of Standards and Technology}
+    \acro{MK}{Master Key}
+    \acro{PKI}{Public Key Infrastructure}
+    \acro{PRF}{Pseudo Random Function}
+    \acro{PoS}{Point-of-Sales}
+    \acro{PRNG}{Pseudo Random Number Generator}
+    \acro{RNG}{Random Number Generator}
+    \acro{ROS}{Random inhomogeneities in an Overdetermined, Solvable system of linear equations}
+    \acro{RT}{Round-Trip}
+    \acro{RTT}{Round-Trip Time}
+    \acro{SPOF}{Single Point of Failure}
+    \acro{SSRF}{Server-Side Request Forgery}
+    \acro{Taler}{GNU Taler}
+    \acro{TRNG}{True Random Number Generator}
+    \acro{URL}{uniform resource locator}
+\end{acronym}
diff --git a/doc/cs/ads/abstract.tex b/doc/cs/ads/abstract.tex
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+++ b/doc/cs/ads/abstract.tex
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+\chapter*{Abstract}
+GNU Taler is an intuitive, fast and socially responsible digital payment system implemented as free software.
+While preserving the customers privacy, GNU Taler is still compliant to regulations.
+\\\\
+The goal of this thesis is to improve Taler's performance and provide cipher agility by adding support for Schnorr's blind signatures.
+To achieve this goal, the current state in research for Schnorr signatures needs to be analyzed.
+After choosing a signature scheme, it has to be integrated into the Taler protocols.
+Besides implementing the redesigned protocols in Taler, an implementation of the cryptographic routines is needed.
+\\\\
+The paper "Blind Schnorr
+Signatures and Signed ElGamal Encryption in the Algebraic Group Model" \cite{cryptoeprint:2019:877} from 2019 (updated in 2021) introducing \gls{CSBS} is used as theoretical basis for our improvements.
+The paper explains why simple Blind Schnorr Signatures are broken and how the Clause Schnorr Blind Signature scheme is secured against this attack.\\
+Compared to the currently used \gls{RSABS}, the new scheme has an additional request, two blinding factors instead of one and many calculations are done twice to prevent attacks.
+\\\\
+The Taler protocols were redesigned to support the Clause Blind Schnorr Signature scheme, including slight alterations to ensure \textit{abort-idempotency}, and then further specified.
+Before starting with the implementation of the redesigned protocols, the cryptographic routines for \gls{CSBS} were implemented as part of the thesis. \\
+All of the implemented code is tested and benchmarks are added for the cryptographic routines.
+\\\\
+Multiple results were achieved during this thesis:
+The redesigned protocols Taler protocols with support for \gls{CSBS}, the implementation of the cryptographic routines, the implementation of Talers core protocols and a detailed comparison between \gls{RSABS} and \gls{CSBS}.
+Overall, the \gls{CSBS} are significantly faster, require less disk space, and bandwidth and provide \textit{cipher agility} for Taler.
+
+\section*{Acknowledgement}
+We would like to kindly thank Christian Grothoff (Bern University of Applied Sciences) for his extensive advice, support and very helpful feedback during our whole thesis.\\
+We also kindly thank Jeffrey Burdges (Web 3, Switzerland) for reviewing the proposal containing the redesigned protocols and giving feedback.\\
+Further, we kindly thank Jacob Appelbaum (Bern University of Applied Sciences, Eindhoven University of Technology) for further results for the performance measurements of our cryptographic routines and the insightful conversations.
diff --git a/doc/cs/ads/glossary.tex b/doc/cs/ads/glossary.tex
new file mode 100644
index 000000000..7132f89a5
--- /dev/null
+++ b/doc/cs/ads/glossary.tex
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+%!TEX root = ../thesis.tex
+
+%
+% vorher in Konsole folgendes aufrufen:
+%	makeglossaries makeglossaries dokumentation.acn && makeglossaries dokumentation.glo
+%
+
+%
+% Glossareintraege --> reference, name, beschreibung
+% Aufruf mit \gls{...}
+%
+% \newglossaryentry{non-repudiation}{name={non-repudiation},plural={non-repudiation},description={After a message is signed, one can not dispute that a message was signed}}
+% \newglossaryentry{sender_authenticity}{name={sender authenticity},plural={sender authenticity},description={The origin/sender of a message can not be forged}}
+% \newglossaryentry{message_integrity}{name={message integrity},plural={message integrity},description={No unauthorized change to the message can be made, the message is tamperproof}}
+\newglossaryentry{hkdf}{
+    name        =   {HKDF},
+    description =   {The HMAC-based Extract-and-Expand Key Derivation Function is a function that takes potentially weak keying material as input and outputs high entropy keying material. For more information see section \ref{sec:kdf}}
+}
+
+\newglossaryentry{25519}{
+    name        = {Curve25519},
+    description = {A popular elliptic curve used in many cryptographic systems based on elliptic curve cryptography. See section \ref{par:curve25519}}
+}
+
+\newglossaryentry{fdh}{
+    name        = {FDH},
+    description = {A Full-Domain Hash is a hash function with an image size equal to the original gorup. See section \ref{sec:rsa-fdh}}.
+}
+
+\newglossaryentry{idempotence}{
+    name        = {idempotence},
+    description = {Idempotence in the context of computer science is a property to ensure that the state of system will not change, no matter how many times the same request was made. See section \ref{abort-idempotency}}
+}
+
+\newglossaryentry{abort-idempotency}{
+    name        = {abort-idempotency},
+    description = {Abort-idempotency is a special case of \gls{idempotence}. On every step in a protocol it needs to be ensured that even on an abort, the same request always receives the same response. See section \ref{abort-idempotency}}
+}
+
+\newglossaryentry{RSABS}{
+    name        = {RSA Blind Signatures},
+    description = {Chaums Blind Signature Scheme based on RSA. See section \ref{sec:blind-rsa-sign}}
+}
+
+\newglossaryentry{CSBS}{
+    name        = {Clause Blind Schnorr Signatures},
+    description = {A secure variant of Blind Schnorr Signature Schemes introduced in section \ref{sec:clause-blind-schnorr-sig}}
+}
+
+% \newglossaryentry{25519}{
+    % name        = {},
+    % description = {}
+% }
diff --git a/doc/cs/ads/header.tex b/doc/cs/ads/header.tex
new file mode 100644
index 000000000..0b53317b5
--- /dev/null
+++ b/doc/cs/ads/header.tex
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+% Hyperlinks
+\usepackage[
+	hidelinks,
+	pdfusetitle,
+]{hyperref}
+
+% Grafiken
+\usepackage{graphicx}
+%Bildpfad
+\graphicspath{{images/}}
+
+% Micro sign
+\usepackage{siunitx}
+
+% Farben
+\usepackage{color}
+\definecolor{LinkColor}{rgb}{0,0,0.2}
+
+% Glossar
+\usepackage[
+	nonumberlist, %keine Seitenzahlen anzeigen
+	%acronym,      %ein Abkürzungsverzeichnis erstellen
+	%section,     %im Inhaltsverzeichnis auf section-Ebene erscheinen
+	toc,          %Einträge im Inhaltsverzeichnis
+]{glossaries}
+\makeglossaries
+\input{ads/glossary}
+
+%Nomenklatur
+\usepackage{nomencl}
+\makenomenclature
+
+%PDF pages
+\usepackage{pdfpages}
+
+%Adjustbox (tikz figures of Taler)
+\usepackage{adjustbox}
+
+%BFH Boxes
+% see BFH example for usage, looks nice!<<
+\LoadBFHModule{listings,terminal,boxes}
+
+%Akronyme
+\usepackage[printonlyused,footnote]{acronym}
+
+% Literaturverweise
+\usepackage[
+	backend=biber,
+	style=alphabetic,
+	%citestyle=authoryear
+]{biblatex}
+\addbibresource{bibliography.bib}
+\addbibresource{bibliography_projekt2.bib}
+
+% TODOs in text
+% documentation: http://tug.ctan.org/macros/latex/contrib/todonotes/todonotes.pdf
+\usepackage{todonotes}
+
+%Crypto Grafiken
+\usepackage{cryptocode}
+%\usepackage{amsmath}
+
+\usepackage{listings}
+\usepackage{xcolor}
+
+\definecolor{mGreen}{rgb}{0,0.6,0}
+\definecolor{mGray}{rgb}{0.5,0.5,0.5}
+\definecolor{mPurple}{rgb}{0.58,0,0.82}
+\definecolor{backgroundColour}{rgb}{0.95,0.95,0.92}
+\definecolor{ApiColor}{HTML}{307FCB}
+\definecolor{whyite}{HTML}{A1C66C} % Needs to be here due to some typo in BFH-CI stuff. Thanks BFH.
diff --git a/doc/cs/ads/history.tex b/doc/cs/ads/history.tex
new file mode 100644
index 000000000..376ee587a
--- /dev/null
+++ b/doc/cs/ads/history.tex
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+\chapter*{Document History}
+\addcontentsline{toc}{chapter}{Document History}
+
+%\begin{center}
+\begin{tabular}{ ||l|l|l|l|| } 
+ \hline
+ Version & Date & Comment & Author \\
+ \hline\hline
+ 0.0.1 & 30.09.2021 & Document created & Gian Demarmels \& Lucien Heuzeveldt \\
+ \hline
+\end{tabular}
+%\end{center}
+\ No newline at end of file