The isim shall deliver the ck to the ue although it

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The ISIM shall deliver the CK to the UE although it is not required that SIP signalling is confidentiality protected. At UE power off the existing SAs in the MT shall be deleted. The session keys and related information in the SA shall never be stored on the ISIM. 8.2 Sharing security functions and data with the USIM When an ISIM application is used for IMS access, only the following options for sharing security functions and data are permitted: - No security functions or data are shared; - Only the sequence number checking mechanism is shared; - Only the algorithm is shared; - Only the algorithm and sequence number checking mechanism are shared; - The authentication key, authentication functions and the sequence number checking mechanism are shared. When a USIM is used for IMS access, only the following option is applicable: - The authentication key, authentication functions and the sequence number checking mechanism are shared. NOTE: If the authentication keys and functions are shared, the cipher/integrity key sets generated during authentication are used with different cipher/integrity algorithms in CS/PS domain and IMS. Note that the same cipher/integrity key set is never used for both CS/PS domain and IMS because the authentication and key agreement protocol is run independently between CS/PS domain and IMS. Therefore there is no danger that the compromise of the cipher/integrity algorithm in one domain would lead to vulnerabilities in the other domain. If the mechanism and data for checking sequence numbers are shared then it shall be required for the authentication failure rate due to synchronization failures to be kept sufficiently low. In particular, the mechanism shall be required to support interleaving authentication in three domains (CS, PS and IMS). Example methods to achieve this are described in Annex G. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 44 Release 12
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9 IMC This clause identifies requirements on the IMC to support IMS access security. The IMC is used to enable access using IMS AKA. The IMC may be used for IMS access by a non-3GPP-only terminal when specified in the access specific annexes of this specification. The IMC shall not used if ISIM or USIM is present. NOTE 1: a non-3GPP-only terminal is a terminal that does not support 3GPP access technology. This clause does not identify any data or functions that may be required on the IMC for non-security purposes. The IMC shall not be part of ISIM, USIM nor SIM. The IMC shall include: - The IMPI; - At least one IMPU; - Home Network Domain Name; - Support for sequence number checking in the context of the IMS Domain; - The same framework for algorithms as specified in TS 33.102 [1]; - An authentication key. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 45 Release 12
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Annex A: Void 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 46 Release 12
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Annex B: Void 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 47 Release 12
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Annex C: Void 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 48 Release 12
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Annex D: Void 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 49 Release 12
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Annex E: Void 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 50 Release 12
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Annex F: Void 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 51 Release 12
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Annex G (informative):
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