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\begin{frame}[fragile]
\frametitle{IPsec}
\begin{itemize}
\item packet encapsulation in OSI Layer 2
\item Linux Kernel provides IPsec implementation
\item exploit Cryptographic Framework in Kernel
\item supported modes:
\begin{itemize}
\item Transport: only the payload is encrypted (IP header is left unchanged)
\item Tunneling: IP header and payload is encrypted
\end{itemize}
\item very high security rating
\item basis for large network-infrastructures
\end{itemize}
\end{frame}
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