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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 $S$:

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\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}.

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