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     4 \begin{document}

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     6 \section*{Homework 10}

     7 

     8 \begin{enumerate}

     9 \item What are the main disadvantages of the following

    10       protocol that establishes a mutual key between two

    11       parties $A$ and $B$ with the help of a mutually trusted

    12       third party $S$:

    13 

    14 \begin{center}

    15 \begin{tabular}{l@{\hspace{2mm}}l}

    16 $A \to S :$ & $A, B$\\

    17 $S \to A :$ & $\{K_{AB}\}_{K_{AS}}$ and $\{\{K_{AB}\}_{K_{BS}} \}_{K_{AS}}$\\

    18 $A \to B :$ & $\{K_{AB}\}_{K_{BS}}$\\

    19 $A \to B :$ & $\{m\}_{K_{AB}}$\\

    20 \end{tabular}

    21 \end{center}

    22 

    23 \item In the context of buffer-overflow attacks, explain briefly

    24 what is meant by a \emph{NOP-sledge}.

    25 

    26 \end{enumerate}

    27 \end{document}

    28 

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