GSM Security
How GSM is attacked and defended, for telecom security professionals working under authorisation. An offensive-minded course that stays within a strict ceiling: it explains attack mechanisms, named tooling and published research, and authorised-assessment methodology, then lands every topic on detection and mitigation.
GSM Security builds on GSM Fundamentals and GSM Architecture and adds the security layer those courses leave out. It opens with the GSM threat model and the authorised-assessment frame: the trust assumptions GSM was built on, where they break, and how a lawful, scoped assessment against your own controlled range is run. It then works through the attack surfaces module by module: the air interface and false base stations; authentication and the COMP128 weakness class; ciphering and cipher downgrade; identity exposure and IMSI catching; the core and signalling surface with MAP and SS7; SMS and supplementary-service abuse; and the tooling used in an authorised lab. The last modules cover detection, monitoring and incident response, and the governance and modern context, including lawful interception versus abuse, NIS2, and the 2G sunset. Every module follows the same shape: threat, mechanism, named tooling and research, authorised methodology, and the detection and mitigation a defender actually deploys. It ends with an interactive authorised-assessment decision walkthrough.
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