\begin{frame}
    \frametitle{Ende-zu-Ende-Verschlüsselung}
    \begin{center}
      \includegraphics[height=0.8\textheight]{img/enc-e2e.png}
    \end{center}
\end{frame}

\begin{frame}
  \frametitle{Email-Verschlüsselung (E2E): PGP}
  \begin{center}
    \includegraphics[height=0.5\textheight]{img/emailselfdefense.png}
    \begin{itemize}
      \item https://emailselfdefense.fsf.org/de/
    \end{itemize}
  \end{center}
\end{frame}

\begin{frame}
  \frametitle{Jabber: Conversations, ChatSecure}
    \begin{center}
      \includegraphics[height=6cm]{img/conversations.png}
      \hspace{0.5cm}
      \includegraphics[height=6cm]{img/chatsecure.png}
    \end{center}
    \url{https://xmpp.net/directory.php}
\end{frame}

\begin{frame}
  \frametitle{Signal}
    \begin{center}
      \includegraphics[height=6cm]{img/signal1.png}
      \hspace{0.5cm}
      \includegraphics[height=6cm]{img/signal2.png}
    \end{center}
\end{frame}