name: MSK
full_form: Master Session Key
context: derivation and MSK validation and derivation (as described in clause 6.5.3). After successful MSK Update procedure the UICC stores the Key Domain ID, MSK ID, MSK and MSK Validity Time (in the form of MTK ID interval). Figure D.1: MSK Update Procedure In case the MSK update MIKEY message is acceptable (i.e. the received MSK ID corresponds to the last generated MUK in the UE, and the MSK Update procedure has been performed successfully) and the V-bit was set in the HDR, then a MSK Verification Message as described in clause 6.4.5.2 (MSK Verification message) shall be produced. The UICC uses the same MUK ID and TS, which were received from the MSK MIKEY Message (see clause 6.1), for the MSK Verification Message Generation.
description: The Master Session Key (MSK) is a critical network attribute used in the derivation and validation of session keys within the UICC (Universal Integrated Circuit Card). It plays a vital role in securing communication between the UE (User Equipment) and the network.
explanation: Given the context from 3GPP TS 33.246, section D.1, MSK is clearly described as an essential parameter for MSK Update Procedure, involving its derivation, validation, storage, and usage in generating a MSK Verification Message. This indicates that MSK serves as a crucial network attribute or parameter.
section_title: D.1	MSK Update Procedure
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