From 65db9a0631815e2d987599ad5d3d0eb9756c0d3b Mon Sep 17 00:00:00 2001
From: Eggert Jung <eggert.s.jung@wischhof13.de>
Date: Wed, 18 Nov 2020 01:20:46 +0100
Subject: [PATCH] start on task 3

---
 doc/report.tex | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 doc/report.tex

diff --git a/doc/report.tex b/doc/report.tex
new file mode 100644
index 0000000..4d1d521
--- /dev/null
+++ b/doc/report.tex
@@ -0,0 +1,84 @@
+\documentclass[%
+  a4paper,%
+  12pt,% <10pt, 9pt>
+  %style=screen,
+  %sender=bottom,
+  blue,% <orange, green, violet>
+  %rgb, <cmyk>
+  %mono,
+  %extramargin,
+  %marginleft, <marginright>
+  ]{tubsartcl}
+\usepackage[utf8x]{inputenc}
+
+\usepackage[ngerman]{babel}
+
+\usepackage{multicol}
+
+\usepackage{tikz}
+\usetikzlibrary{positioning,fit,calc}
+\tikzset{block/.style={draw, thick, text width=1cm, minimum height=1cm, align=center},   
+% the align command is used to align the block diagram at the center  
+% the height command adjust the height of the block diagram  
+% here block diagram refers to the whole diagram, not the single block  
+% the thick command here signifies the border of all the blocks used inside the block diagram. You can change it to thin command if you want the thin edge of the blocks  
+line/.style={-latex}   % the lesser the width the greater will be the diagram window  
+}  
+
+% Titelseiten-Elemente
+\title{Introduction to IT-Security WS 20/21}
+\subtitle{Exercise 01}
+\author{Daniel Tschertkow \& Eggert Jung}
+
+\begin{document}
+
+\maketitle%[<plain/image/imagetext>,<logo=left/right>]
+\begin{multicols}{2}
+    \begin{tabular}{rl}
+        \textbf{GITZ Kennung}:    & y0058800 \\
+        \textbf{Matrikelnr.}:     & 4200606  \\
+        \textbf{Studiengang}:     & Informatik Bachelor  \\
+        \textbf{Prüfungsordnung}: & BPO2015  \\
+    \end{tabular}
+    \begin{tabular}{rl}
+        \textbf{GITZ Kennung}:    & y0085044 \\
+        \textbf{Matrikelnr.}:     & 4839284  \\
+        \textbf{Studiengang}:     & IST Bachelor  \\
+        \textbf{Prüfungsordnung}: & 5  \\
+    \end{tabular}
+\end{multicols}
+\newpage
+
+\section{Security goals}
+
+\section{Simple combinatorics}
+
+\section{XOR cipher}
+\begin{tikzpicture}  
+  \node[block] (m1) {$M_1$};  
+  \node[block,below=of m1] (k1) {$K$};
+  \node[block,below=of k1] (c1) {$C_1$};
+  \node at ($(m1)!0.5!(k1)$){$\oplus$};
+  \node at ($(k1)!0.5!(c1)$){$=$};
+  \node[block,text width=2cm, right=of m1] (mgen) {$C_1 \oplus K$};
+  \node[xshift=-2mm] at ($(m1)!0.5!(mgen)$){$=$};
+  \node[draw,inner xsep=5mm,inner ysep=5mm,fit=(mgen)(m1)(k1)(c1)](g){};
+
+  \node[block, right=of m1, xshift=8cm] (m2) {$M_2$};  
+  \node[block,below=of m2] (k2) {$K$};
+  \node[block,below=of k2] (c2) {$C_2$};
+  \node at ($(m2)!0.5!(k2)$){$\oplus$};
+  \node at ($(k2)!0.5!(c2)$){$=$};
+  \node[block,text width=2cm, left=of k2] (kgen) {$M_2 \oplus C_2$};
+  \node[xshift=2mm] at ($(k2)!0.5!(kgen)$){$=$};
+  \node[draw, inner xsep=5mm,inner ysep=5mm,fit=(kgen)(m2)(k2)(c2)](h){};
+
+  \draw[->] (m2) -| (kgen);
+  \draw[->] (c2) -| (kgen);
+
+  \draw[->] (c1) -| ([xshift=-1cm]mgen);
+  \draw[->] (kgen) -| ([xshift=1cm]mgen);
+
+\end{tikzpicture}  
+
+\end{document}