diff --git a/cheatsheet.tex b/cheatsheet.tex
index 05781ce..bcd5fd3 100644
--- a/cheatsheet.tex
+++ b/cheatsheet.tex
@@ -77,16 +77,23 @@
 \begin{center}
      \section*{KN CheatSheet}
 \end{center}
-\section{ISO/OSI}
-    \begin{tightitemize}
-        \item[7] Application
-        \item[6] Presenentation
-        \item[5] Session
-        \item[4] Transport
-        \item[3] Network
-        \item[2] Data Link
-        \item[1] Physical
-    \end{tightitemize}
+    \subsection{ISO/OSI}
+        \begin{tightitemize}
+            \item[7] Application
+            \item[6] Presenentation
+            \item[5] Session
+            \item[4] Transport
+            \item[3] Network
+            \item[2] Data Link
+            \item[1] Physical
+        \end{tightitemize}
+    \subsection{Protokolle}
+        \begin{itemize}
+            \item http: 80
+            \item https: 443
+            \item TCP: (oft) 6
+            \item ssh: 22
+        \end{itemize}
 \section{Security}
     \subsection{Grundlagen}
     \begin{tightitemize}
@@ -204,7 +211,7 @@
                 \item Cipher Suite= Symmetrisches, asymmetrisches und MAC-Verfahren
                 \item Negotiation: Cipher Suite festlegen
                 \item Server \& Client Nonce um komplettes Playback zu entdecken
-                \item Data Record trägt $2^14$byte
+                \item Data Record trägt $2^{14}$byte
                 \item Daten und MAC werden symmetrisch verschlüsselt
                 \item Grafik Folie 1.69 (SSL durch die Layers)
                 \item Protokoll aufgeteilt
@@ -312,7 +319,7 @@
     \subsection{Formeln}
         \begin{tightitemize}
             \item power $P=V^2$
-            \item Dämpfung (attenuation) $dB=10\cdot\lg\frac{P_1}{P_2}$
+            \item Dämpfung (attenuation) $dB=10\cdot\lg\frac{P_2}{P_1}$
             \begin{tightitemize}
                 \item Falls positiv: Verstärkung (amplification)
             \end{tightitemize}