Importance

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Abstract

The invention concerns countering a rogue shell threat in a cellular mobile communication system by an apparatus or a method for authentication in a mobile communication system comprising a mobile communication network (VLR/SGSN/HLR/RNC . . . ) and mobile stations (MS) wherein the network provides a service to a mobile station (MS) after authentication of the mobile station wherein the mobile station (MS) comprises a portable module (USIM) wherein the mobile station (MS) comprises a mobile equipment (ME) that is able to communicate with the network and that is able to communicate with the portable module (USIM) wherein the network sends random data (RAND) to the mobile station (MS) wherein the network (AUC, SGSN) calculates response data (XRES(i)) and key data (CK, IK) at least from the random data (RAND) and/or from a key (K) stored in the network (AUC/HLR) wherein the portable module (USIM) of the mobile station (MS) calculates response data (RES(i)) and key data (CK, IK) at least from the random data (RAND) and/or from a key (K) stored in the portable module (USIM) wherein the portable module (USIM) stores the calculated key data (CK, IK) wherein the portable module (USIM) transmits the response data (RES) to the mobile equipment (ME) which (ME) sends response data (RES) to the network wherein the portable module calculates further key data (CSK, ISK) from random data (RAND) and/or from the calculated key data (CK, IK).

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First Claim