464 \item Guarantee confidentiality and authenticity: binds two parts of a message --- 

   464 \item Guarantee confidentiality and authenticity: binds two parts of a message --- 

   465 \bl{$\{X,Y\}_K$} is not the same as \bl{$\{X\}_K$} and \bl{$\{Y\}_K$}.

   465 \bl{$\{X,Y\}_K$} is not the same as \bl{$\{X\}_K$} and \bl{$\{Y\}_K$}.

   466 \end{itemize}

   466 \end{itemize}

   467 \end{center}

   467 \end{center}

   468 

   468 

   471 \end{frame}}

   469 \end{frame}}

   472 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   

   470 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   

   473 

   471 

   474 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   472 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   475 \begin{frame}[c]

   473 \begin{frame}[c]