diff --git a/Assignment 4 - Protokollsicherheit (Praxis)/abgabe.tex b/Assignment 4 - Protokollsicherheit (Praxis)/abgabe.tex
index 1f54af8..33043fe 100644
--- a/Assignment 4 - Protokollsicherheit (Praxis)/abgabe.tex	
+++ b/Assignment 4 - Protokollsicherheit (Praxis)/abgabe.tex	
@@ -87,7 +87,18 @@
 
 \newpage
 \begin{exercise}[Key Establishment]{2.2.}
-
+\protocolflow{1.5}{0.75}{ 
+ \node[] (A) at (0,0) {\textbf{Alice}};
+ \node[] (E) at (5,0) {\textbf{Eve}};
+ \node[] (B) at (8,0) {\textbf{Bob}};
+ \node[] (CA) at (-1,-4.5) {\text{check $N_A$}};
+ \package{0,-1}{5,-1}{$ID_A, N_A$}
+ \textcolor{red}{\package{5,-2}{0,-2}{$ID_A, N_A$}}
+ \package{0,-3}{5,-3}{$\{ N_A, K'_{AB} \}_{K_{AB}}$}
+ \textcolor{red}{\package{5,-4}{0,-4}{$\{ N_A, K'_{AB} \}_{K_{AB}}$}}
+ \package{0,-5}{5,-5}{$\{ N_A \}_{K'_{AB}}$}
+ \package{5,-6}{0,-6}{\textcolor{red}{$N'_B$}}
+}
 \end{exercise}
 
 \newpage