Subscriber authentication in a mobile communications system

Subscriber authentication in a mobile communications system

An authentication procedure in a Global System for Mobile Communications (GSM)-based mobile communications system relies on a challenge and response principle. A 32-bit Signed Response (SRES) parameter is calculated by an A3 algorithm from a 128-bit random number (RAND) and a 128-bit authentication...

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1. Verfasser: JUHANI MURTO
Format: Patent
Sprache:eng
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ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
WIRELESS COMMUNICATIONS NETWORKS
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description An authentication procedure in a Global System for Mobile Communications (GSM)-based mobile communications system relies on a challenge and response principle. A 32-bit Signed Response (SRES) parameter is calculated by an A3 algorithm from a 128-bit random number (RAND) and a 128-bit authentication key Ki in a mobile station, and in an authentication center, and the SRES values are compared. A Cellular Authentication and Voice Encryption (CAVE) algorithm having a 152-bit input parameter and a 18-bit output parameter is employed as the A3 algorithm. Parameter adaptation functions are provided between the input parameter of the CAVE algorithm and the GSM-type input parameters, namely the random number RAND and the authentication key Ki, as well as between the output parameter of the CAVE algorithm and the GSM output parameter, namely the signed response SRES.
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
WIRELESS COMMUNICATIONS NETWORKS
title Subscriber authentication in a mobile communications system
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