An Overview of The GSM Security System

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An Overview of The GSM Security System
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by
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Jeff Vigil
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Overview
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Purposes of Security
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Architecture
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The Subscriber Identification Module
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Authentication Procedure
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Data Encryption
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SIM security
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Purposes of security
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Prevent unauthorized access
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Prevent fraudulent impersonations
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Protect the privacy of the users
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Prevent theft of mobiles
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Architecture
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Home Network
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HLR - Home Location Register
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AuC - Authentication Center
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Visiting Network
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VLR - Visitors Location Register
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MSC - Mobile Services Switching Center
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BSC - Base Station Controller
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BS - Base Station
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Mobile Station
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ME - Mobile Equipment
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IMEI - International Mobile Equipment Identity
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SIM - Subscriber Identity Module
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IMSI - International Mobile Subscriber Identity
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Ki - SIMs Secret key
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Authentication Procedure
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Data Encryption