\section{Osmocom SIMtrace}

\subsection{Debugging SIM drivers and STK apps}

\begin{frame}{Debugging SIM toolkit applications is hard}
\begin{itemize}
	\item Regular end-user phone does not give much debugging
	\item SIM card itself has no debug interface for printing error messages, warnings, etc.
	\item However, as SIM-ME interface is unencrypted, sniffing / tracing is possible
	\item Commercial / proprietary solutions exist, but are expensive
\end{itemize}
\end{frame}

\subsection{Osmocom SIMtrace Introduction}

\begin{frame}{Introducing Osmocom SIMtrace}
\begin{itemize}
	\item Osmocom SIMtrace is a passive (U)SIM-ME communication sniffer
	\item Insert SIM adapter into actual phone
	\item Insert (U)SIM into SIMtrace hardware
	\item SIMtrace hardware provides USB interface to host PC
	\item {\tt simtrace} program on PC encapsulates APDU in GSMTAP
	\item GSMTAP is sent via UDP to localhost
	\item wireshark dissector for GSM TS 11.11 decodes APDUs
\end{itemize}
\end{frame}

\subsection{Osmocom SIMtrace Hardware}

\begin{frame}{Osmocom SIMtrace Hardware}
\begin{itemize}
	\item Hardware is based around AT91SAM7S controller
	\item SAM7S Offers two ISO 7816-3 compatible USARTs
	\item USARTs can be clock master (SIM reader) or slave (SIM card)
	\item Open Source Firmware on SAM7S implementing APDU sniffing
	\item Auto-bauding depending CLK signal, PPS supported
	\item Only prototype hardware right, but will be manufactured in Q1/2011
\end{itemize}
\end{frame}