FIELD: physics; communication.
SUBSTANCE: invention relates to mobile communication. A mobile station (MS), base station (BS) and an authentication, authorisation and account server (AAA) receive the first master session key through first EAP authentication for the mobile station (MS) in a "EAP-in-EAP" connection. After the first EAP authentication, a second master session key (MSK) is received through second EAP authentication for the mobile station (MS) in a "EAP-in-EAP" connection. An authorisation key is generated based on use of the first and second pairs of master keys, generated through truncation of the first and second master session keys, respectively.
EFFECT: prevention of interception of authentication information.
18 cl, 6 dwg
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