
diff -r e1e314c1bb61 -r efcac3016613 hws/hw07.tex
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+++ b/hws/hw07.tex	Mon Sep 23 17:39:31 2013 +0100
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+\documentclass{article}
+\usepackage{charter}
+\usepackage{hyperref}
+\usepackage{amssymb}
+\usepackage{proof}
+
+\begin{document}
+
+\section*{Homework 7}
+
+\begin{enumerate}
+\item Suppose a judgement is of the form:
+\begin{center}
+$Alice\;\textit{says}\;S \wedge Bob\;\textit{says}\;S \vdash Bob\;\textit{says}\;S \wedge Alice\;\textit{says}\;S$
+\end{center}
+
+Assume you want to use the inference rule
+
+\begin{center}
+\mbox{\infer{\Gamma \vdash F_1 \wedge F_2}{\Gamma \vdash F_1 & \Gamma \vdash F_2}}
+\end{center}
+
+for constructing a proof of the judgement. What do the premises look like? 
+
+\item The informal meaning of the formula \mbox{$P\;\mapsto\;Q$} is `$P$ speaks for
+$Q$'. Give a definition for this formula in terms of $\textit{says}$.
+
+\item In Unix, what should be the general architecture of a network application that 
+processes potentially hostile data from the Internet? (Hint: Focus on the fact that in Unix
+you can give different privileges to processes.)
+
+\item Explain what are the differences between dictionary and brute forcing attacks  against  passwords.
+
+\end{enumerate}
+\end{document}
+
+%%% Local Variables: 
+%%% mode: latex
+%%% TeX-master: t
+%%% End: 




