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\fancyfoot[L]{\tiny IETF 70} 
\fancyfoot[C]{\tiny TLS 1.2 Update} 
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\begin{document}


        
\begin{slide}
\begin{center}
\LARGE{{\bf}TLS Extractors}\\

\vspace{.3 in}
\large{Eric Rescorla}\\
\large{Network Resonance}\\
\large{\texttt{ekr@networkresonance.com}}

\end{center}
\end{slide}


\begin{slide}
\heading{General Idea}

\begin{itemize}
\item Other protocols want to use TLS negotiation
\begin{itemize}
\item But for some reason access keying material
\end{itemize}
\item Examples
\begin{itemize}
\item SCTP Auth
\item DTLS-SRTP
\item TCP Auth
\item EAP
\end{itemize}
\end{itemize}

\end{slide}


\begin{slide}
\heading{Example: DTLS-SRTP}

\vspace{-.4 in}
\includegraphics{dtls-srtp1}

\end{slide}


\begin{slide}
\heading{Simple Idea}

\begin{itemize}
\item General technique for generating keys from TLS handshake (\emph{Extractor})
\item Requirements
\begin{itemize}
\item Each \emph{exported keying material} (EKM) is unique
\item Infeasible to go from $EKM_1$ to $EKM_2$
\item Infeasible to go from $EKM$ to $MS$
\end{itemize}
\item Algorithm is: $EKM = PRF(master\_secret, label,
              SecurityParameters.client\_random +
              SecurityParameters.server\_random)[length])$
\item labels MUST be registered
\end{itemize}
\end{slide}


\begin{slide}
\heading{Changes From Last Version}

\begin{itemize}
\item Labels no longer MUST have a fixed prefix
\item Text that you should somehow indicate you're doing this
\begin{itemize}
\item Like with an extension
\end{itemize}
\end{itemize}

\end{slide}

\begin{slide}
\heading{Where to from here?}

\begin{itemize}
\item Comments?
\item Should we accept this as a WG item?
\item draft-rescorla-tls-extractor-01.txt
\end{itemize}

\end{slide}

\end{document}