\select@language {english} \addvspace {10\p@ } \addvspace {10\p@ } \contentsline {figure}{\numberline {2.1}{\ignorespaces Growth of mobile GSM subscriptions. Compiled from \cite {GSM2009,GSM_history2011,GSM_stats2011}}}{6} \contentsline {figure}{\numberline {2.2}{\ignorespaces The main components of a GSM network.}}{8} \contentsline {figure}{\numberline {2.3}{\ignorespaces Authentication procedure.}}{15} \contentsline {figure}{\numberline {2.4}{\ignorespaces Mapping of functional entities on the 900\tmspace +\thinmuskip {.1667em}MHz\ band.}}{17} \contentsline {figure}{\numberline {2.5}{\ignorespaces Theoretical arrangement of radio cells compared to a realistic alignment. Cells with the same number share the same frequency \cite {GSM2009}.}}{19} \contentsline {figure}{\numberline {2.6}{\ignorespaces Ciphering procedure for one frame of voice data. Adopted from \cite {kommsys2006}.}}{21} \contentsline {figure}{\numberline {2.7}{\ignorespaces The combination of FDMA and TDMA.}}{22} \contentsline {figure}{\numberline {2.8}{\ignorespaces Hierarchical Composition of the different frames.}}{23} \contentsline {figure}{\numberline {2.9}{\ignorespaces Structural Comparison of different Burst types. After \cite {GSM2009}.}}{24} \contentsline {figure}{\numberline {2.10}{\ignorespaces Mapping of virtual channels on time slots.}}{26} \contentsline {figure}{\numberline {2.11}{\ignorespaces A commercial catcher by Rhode \& Schwarz \cite {fox} and a self built catcher introduced at Defcon 2010 \cite {def_catcher}.}}{29} \contentsline {figure}{\numberline {2.12}{\ignorespaces IMSI catching procedure. Adopted and simplified from \cite {mueller}.}}{30} \addvspace {10\p@ } \contentsline {figure}{\numberline {3.1}{\ignorespaces Circuit board of the Motorola C123 with its components \cite {osmo_wiki_c123}.}}{38} \contentsline {figure}{\numberline {3.2}{\ignorespaces Interaction of the OsmocomBB components with the ICDS software.}}{39} \contentsline {figure}{\numberline {3.3}{\ignorespaces System Information 1 Message \cite {protocols1999}.}}{41} \contentsline {figure}{\numberline {3.4}{\ignorespaces Base stations and their neighbourhood connections at the Technische Fakult\"at.}}{46} \contentsline {figure}{\numberline {3.5}{\ignorespaces Comparison between a normal neighbourhood subgraph and a tainted one.}}{46} \contentsline {subfigure}{\numberline {(a)}{\ignorespaces {Normal neighbourhood}}}{46} \contentsline {subfigure}{\numberline {(b)}{\ignorespaces {Tainted neighbourhood}}}{46} \contentsline {figure}{\numberline {3.6}{\ignorespaces Procedure taken when the network has a call/text waiting for a passive subscriber.}}{49} \contentsline {figure}{\numberline {3.7}{\ignorespaces System architecture of the ICDS. The arrows indicate the flow of data.}}{50} \contentsline {figure}{\numberline {3.8}{\ignorespaces Configuration Dictionary in the settings file.}}{51} \contentsline {figure}{\numberline {3.9}{\ignorespaces The ICDS main window.}}{53} \contentsline {figure}{\numberline {3.10}{\ignorespaces Dialogs for different settings.}}{56} \contentsline {subfigure}{\numberline {(a)}{\ignorespaces {Filters window.}}}{56} \contentsline {subfigure}{\numberline {(b)}{\ignorespaces {Rules window.}}}{56} \contentsline {subfigure}{\numberline {(c)}{\ignorespaces {Databases window.}}}{56} \contentsline {subfigure}{\numberline {(d)}{\ignorespaces {Encryption window (not yet implemented).}}}{56} \addvspace {10\p@ } \contentsline {figure}{\numberline {4.1}{\ignorespaces Scan durations for the sample data sets.}}{62} \contentsline {figure}{\numberline {4.2}{\ignorespaces Open Source IMSI Catcher (left) with USRP (black) and external clock (blue) and the ICDS (right) with the Motorola C123 connected.}}{64} \contentsline {figure}{\numberline {4.3}{\ignorespaces Excerpt of a \texttt {OpenBTS.conf}.}}{65} \contentsline {figure}{\numberline {4.4}{\ignorespaces Nokia 3310 NetMonitor screenshots.}}{66} \contentsline {subfigure}{\numberline {(a)}{\ignorespaces {Connected cell information.}}}{66} \contentsline {subfigure}{\numberline {(b)}{\ignorespaces {Neighbouring cell measurements.}}}{66} \contentsline {figure}{\numberline {4.5}{\ignorespaces Takeover attack of an IMSI catcher on a base station.}}{69} \addvspace {10\p@ } \addvspace {10\p@ } \addvspace {10\p@ } \addvspace {10\p@ } \contentsline {figure}{\numberline {C.1}{\ignorespaces System Information 1 Message}}{86} \contentsline {figure}{\numberline {C.2}{\ignorespaces System Information 2 Message}}{87} \contentsline {figure}{\numberline {C.3}{\ignorespaces System Information 3 Message}}{88} \contentsline {figure}{\numberline {C.4}{\ignorespaces System Information 4 Message}}{89} \addvspace {10\p@ }