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GSM Security Overview - pervez4pari - 08-16-2017 GSM Security Overview [attachment=18119] GSM Security Goals Confidentiality and Anonymity on the radio path Strong client authentication to protect the operator against the billing fraud Prevention of operators from compromising of each others security Inadvertently Competition pressure GSM Security Design Requirements The security mechanism MUST NOT Add significant overhead on call set up Increase bandwidth of the channel Increase error rate Add expensive complexity to the system MUST Cost effective scheme Define security procedures Generation and distribution of keys Exchange information between operators Confidentiality of algorithms GSM Security Features Key management is independent of equipment Subscribers can change handsets without compromising security Subscriber identity protection not easy to identify the user of the system intercepting a user data Detection of compromised equipment Detection mechanism whether a mobile device was compromised or not Subscriber authentication The operator knows for billing purposes who is using the system Signaling and user data protection Signaling and data channels are protected over the radio path GSM Mobile Station Mobile Station Mobile Equipment (ME) Physical mobile device Identifiers IMEI International Mobile Equipment Identity Subscriber Identity Module (SIM) Smart Card containing keys, identifiers and algorithms Identifiers Ki Subscriber Authentication Key IMSI International Mobile Subscriber Identity TMSI Temporary Mobile Subscriber Identity MSISDN Mobile Station International Service Digital Network PIN Personal Identity Number protecting a SIM LAI location area identity |