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\section*{Homework 2}

\begin{enumerate}
\item What does the principle of least privilege say?

\item In which situations can the access control mechanism of Unix
file permissions be used?

\begin{itemize}
\item[(a)] Alice wants to have her files readable, except for her office mates.
\item[(b)] Bob and Sam want to share some secret files.
\item[(c)] Root wants some of her files to be public.
\end{itemize}

\item What should be the architecture of a network application under Unix 
be that processes potentially hostile data?

\item What does the Bell --- La Pudela model ensure? Similarly, what does the Biba model ensure?
\end{enumerate}

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