475 Unix essentially can only distinguish between two security levels (root and non-root).

   475 Unix essentially can only distinguish between two security levels (root and non-root).

   476 

   476 

   477 \begin{itemize}

   477 \begin{itemize}

   478 \item In military applications you often have many security levels (top-secret, secret, confidential, unclassified)\bigskip\pause 

   478 \item In military applications you often have many security levels (top-secret, secret, confidential, unclassified)\bigskip\pause 

   479 

   479 

   481 

   481 

   482 \begin{itemize}

   482 \begin{itemize}

   483 \item read: your own level and below

   483 \item read: your own level and below

   484 \item write: your own level and above

   484 \item write: your own level and above

   485 \end{itemize}

   485 \end{itemize}