name: 3GPP TS 33.401
full_form: 3GPP Technical Specification 33.401
context: In order for the UE to derive a mapped EPS security context for an inter-system change from A/Gb mode or Iu mode to S1 mode in EMM-CONNECTED mode, the MME shall generate a KSISGSN, create a nonceMME and generate the K'ASME using the created nonceMME as indicated in 3GPPÂ TSÂ 33.401Â [19]. The MME shall include the selected NAS algorithms, nonceMME and generated KSISGSN (associated with the K'ASME) in the NAS security transparent container for handover to E-UTRAN. The MME shall derive the EPS NAS keys from K'ASME.
  When the UE receives the command to perform handover to E-UTRAN, the UE shall derive K'ASME, as indicated in 3GPPÂ TSÂ 33.401Â [19], using the nonceMME received in the NAS security transparent container. Furthermore, the UE shall associate the derived K'ASME with the received KSISGSN and derive the EPS NAS keys from K'ASME.
  When the UE has a PDN connection for emergency bearer services and has no current UMTS security context, the MME shall set EIA0 and EEA0 as the selected NAS security algorithms in the NAS security transparent container for handover to E-UTRAN. The MME shall create a locally generated K'ASME. The MME shall set the KSI value of the associated security context to "000" and the type of security context flag to "mapped security context" in the NAS security transparent container for handover to E-UTRAN.
  When the UE receives the command to perform handover to E-UTRAN and has a PDN connection for emergency bearer services, if EIA0 and EEA0 as the selected NAS security algorithms are included in the NAS security transparent container for handover to E-UTRAN, the UE shall create a locally generated K'ASME. The UE shall set the KSI value of the associated security context to the KSI value received.
  If the inter-system change from A/Gb mode or Iu mode to S1 mode in EMM-CONNECTED mode is not completed successfully, the MME and the UE shall delete the new mapped EPS security context.
  The establishment of a mapped EPS security context during inter-system change from N1 mode to S1 mode in EMM-CONNECTED mode is specified in 3GPPÂ TSÂ 24.501Â [54] clauseÂ 4.4.2.4.
description: This specification provides details on the security architecture and protocols used in the 3GPP system, including the EPS.
explanation: Categorized as a Specification because it outlines technical requirements and standards for 3GPP security.
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