GSM Features and Security - High-Tech Tools for the Law GSM功能和安全的高科技工具法.pptVIP

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GSM Features and Security - High-Tech Tools for the Law GSM功能和安全的高科技工具法.ppt

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GSM Features and Security - High-Tech Tools for the Law GSM功能和安全的高科技工具法

GSM and UMTS Security Contents Introduction to mobile telecommunications Second generation systems - GSM security Third generation systems - UMTS security Focus is on security features for network access Introduction to Mobile Telecommunications Cellular radio network architecture Location management Call establishment and handover Cellular Radio Network Architecture Radio base stations form a patchwork of radio cells over a given geographic coverage area Radio base stations are connected to switching centres via fixed or microwave transmission links Switching centres are connected to the public networks (fixed telephone network, other GSM networks, Internet, etc.) Mobile terminals have a relationship with one home network but may be allowed to roam in other visited networks when outside the home network coverage area Cellular Radio Network Architecture Location Management The network must know a mobile’s location so that incoming calls can be routed to the correct destination When a mobile is switched on, it registers its current location in a Home Location Register (HLR) operated by the mobile’s home operator A mobile is always roaming, either in the home operator’s own network or in another network where a roaming agreement exists with the home operator When a mobile registers in a network, information is retrieved from the HLR and stored in a Visitor Location Register (VLR) associated with the local switching centre Location Management Call Establishment and Handover First Generation Mobile Phones First generation analogue phones (1980 onwards) were horribly insecure Cloning: your phone just announced its identity in clear over the radio link easy for me to pick up your phone’s identity over the air easy for me to reprogram my phone with your phone’s identity then all my calls are charged to your bill Eavesdropping all you have to do is tune a radio receiver until you can hear someone talking Second Generation Mobile Phones – The GSM Standard Second generation