diff -r 4020ba76cc07 -r 0d491b5654f9 slides/slides05.tex
--- a/slides/slides05.tex	Tue Oct 21 09:33:13 2014 +0100
+++ b/slides/slides05.tex	Tue Oct 21 10:39:45 2014 +0100
@@ -314,6 +314,27 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \mode<presentation>{
 \begin{frame}[c]
+\frametitle{Trusted Third Party}
+
+Simple protocol for establishing a secure connection via a mutually
+trusted 3rd party (server):
+
+\begin{center}
+\begin{tabular}{r@ {\hspace{1mm}}l}
+\bl{$A \rightarrow S :$} & \bl{$A, B$}\\
+\bl{$S \rightarrow A :$} & \bl{$\{K_{AB}\}_{K_{AS}}$} and \bl{$\{\{K_{AB}\}_{K_{BS}} \}_{K_{AS}}$}\\
+\bl{$A \rightarrow B :$} & \bl{$\{K_{AB}\}_{K_{BS}} $}\\
+\bl{$A \rightarrow B :$} & \bl{$\{m\}_{K_{AB}}$}\\
+\end{tabular}
+\end{center}
+
+\end{frame}}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\mode<presentation>{
+\begin{frame}[c]
 \frametitle{Protocol Attacks}
 
 \begin{itemize}
@@ -339,7 +360,8 @@
 \begin{itemize}
 \item the idea is to have a certificate authority (CA)
 \item you go to the CA to identify yourself
-\item CA: ``I, the CA, have verified that public key \bl{$P^{pub}_{Bob}$} belongs to Bob''\bigskip
+\item CA: ``I, the CA, have verified that public key 
+  \bl{$P^{pub}_{Bob}$} belongs to Bob''\bigskip
 \item CA must be trusted by everybody
 \item What happens if CA issues a false certificate? Who pays in case of loss? (VeriSign 
 explicitly limits liability to \$100.)
@@ -430,6 +452,21 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Person-in-the-Middle}
+
+\begin{itemize}
+\item Border Gateway Protocol (BGP) --- routers believe 
+  their neighbours
+\item it is possible to advertise bad routes
+\item can be done over continents\bigskip 
+\end{itemize}
+
+\hfill\footnotesize\url{http://www.renesys.com/2013/11/mitm-internet-hijacking/}
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \mode<presentation>{
 \begin{frame}[c]
 \frametitle{Best Practices}
@@ -496,6 +533,22 @@
 \end{frame}}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Mid-Term}
+
+\begin{itemize}
+\item homework, handouts, programs\ldots
+\end{itemize}\bigskip\bigskip\bigskip
+
+\begin{center}
+{\huge\bf\alert{Any Questions?}}
+\end{center}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
+
 \end{document}
 
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