Structure: Introduction - GSM spreading - Historic cornerstones - Imposed threats (terror laws) Basics - GSM - Infrastructure - Cell Structure - BTS - Protocol - Layers - Channels (logical/physical) - GSM Security - Authentication - IMSI-Catcher - Security threats - Flaw used - Architecture - Differences to regular Catcher/BTS Hardware - C123 - Specs - Data Cable (- USRP) Software - OsmocomBB - Concept - Install - Tools (layer23, osmocom, wireshark integration) - Interfaces (- WEKA) (- GNU-Radio) IMSI-Catcher-Detection - How to identify - Configuration of catcher - Interesting parameters (- Identify Jamming) (- Machine learning approach) - Usage - Scenarios Conclusion - Extensions