hws/hw06.tex
changeset 134 e4fda36422dd
parent 97 efcac3016613
child 298 5f6b72bb5f7f
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133:3342571ec447 134:e4fda36422dd
    13 $P\;\textit{says}\;F$
    13 $P\;\textit{says}\;F$
    14 \end{center}
    14 \end{center}
    15 
    15 
    16 where $P$ is a principal and $F$ a formula. Give two inference rules
    16 where $P$ is a principal and $F$ a formula. Give two inference rules
    17 of access-control logic involving $\textit{says}$.
    17 of access-control logic involving $\textit{says}$.
    18 
       
    19 \item (Removed) Was already used in HW 5
       
    20 
    18 
    21 \item 
    19 \item 
    22 Assume an access control logic with security levels, say top secret ({\it TS}),
    20 Assume an access control logic with security levels, say top secret ({\it TS}),
    23 secret ({\it S}) and public ({\it P}), with
    21 secret ({\it S}) and public ({\it P}), with
    24 \begin{center}
    22 \begin{center}