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\section*{Homework 10}

\begin{enumerate}
\item What are the main disadvantages of the following
      protocol that establishes a mutual key between two
      parties $A$ and $B$ with the help of a mutually trusted
      third party $S$:

\begin{center}
\begin{tabular}{l@{\hspace{2mm}}l}
$A \to S :$ & $A, B$\\
$S \to A :$ & $\{K_{AB}\}_{K_{AS}}$ and $\{\{K_{AB}\}_{K_{BS}} \}_{K_{AS}}$\\
$A \to B :$ & $\{K_{AB}\}_{K_{BS}}$\\
$A \to B :$ & $\{m\}_{K_{AB}}$\\
\end{tabular}
\end{center}

\item In the context of buffer-overflow attacks, explain briefly
what is meant by a \emph{NOP-sledge}.

\end{enumerate}
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