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     5 \begin{document}

     6 

     7 \section*{Homework 2}

     8 

     9 \begin{enumerate}

    10 \item What does the principle of least privilege say?

    11 

    12 \item In which situations can the access control mechanism of Unix

    13 file permissions be used?

    14 

    15 \begin{itemize}

    16 \item[(a)] Alice wants to have her files readable, except for her office mates.

    17 \item[(b)] Bob and Sam want to share some secret files.

    18 \item[(c)] Root wants some of her files to be public.

    19 \end{itemize}

    20 

    21 \item What should be the architecture of a network application under Unix 

    22 be that processes potentially hostile data?

    23 

    24 \item What does the Bell --- La Pudela model ensure? Similarly, what does the Biba model ensure?

    25 \end{enumerate}

    26 

    27 \end{document}

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