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\section*{Homework 3}

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

\item In which of the following 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 the architecture of a network application under Unix 
be that processes potentially hostile data?

\item How can you exploit the fact that every night root has a cron
job that deletes the files in \texttt{/tmp}?

\item What does it mean that the program \texttt{passwd} has the \texttt{setuid}
bit set? Why is this necessary?

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

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