extend caption

doc/report.tex

@@ -81,7 +81,8 @@ line/.style={-latex}   % the lesser the width the greater will be the diagram wi
   \draw[->] (c1) -| ([xshift=-1cm]mgen);
   \draw[->] (kgen) -| ([xshift=1cm]mgen);
 \end{tikzpicture}  
-\caption{This Diagram shows how an Attacker can calculate the Key $K$ and the Message $M_1$.}
+\caption{This Diagram shows how an attacker can calculate the key $K$ and the message $M_1$. \newline
+    $C_x$, $C_y$ and $M_2$ are known to the attacker.}
 \end{figure}
 A few requirements must be satisfied in order to get hold of the $K$ and the $M_1$:
 \begin{itemize}