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A3 AlgorithmA3 algorithm is a validation process used in a GSM network for authentication of the mobile user that is requesting service. The A3 algorithm is a mathematical process that combines a secret number (called Ki in documents) stored in the SIM chip and a second number that is transferred between the base station and the mobile station. The numerical result of the A3 algorithm calculation is transmitted back to the base station. It is then compared to a previously internally calculated answer also using the A3 algorithm and the same two input quantities, in the base station controller or in the MSC. When the same matching result occurs for both the mobile supplied information and previously stored information, the customer has granted access.
GSM Books
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Introduction to GSM
This book explains the basic components, technologies used, and operation of GSM systems. This book starts with the system components and basic services that the GSM system can provide. You will learn that the key types of GSM devices include single mode and dual mode mobile telephones, wireless PCMCIA cards, embedded radio modules, and external radio modems. You will then discover the different types of available services such as multiple types of voice services, data services, group call, and messaging services. $19.99 Printed, $16.99 eBook |
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