name: MAC-S
full_form: Resynchronisation Authentication Code
context: procedure, when the HE/AuC receives an authentication data request with a "synchronisation failure indication" and AUTS, the detailed procedure is defined as follows: - MAC-S and SQNMS AK are retrieved from AUTS. - AK is calculated using f5 function with MAC-S as one input. - SQNMS is retrieved by computing SQNMS AK AK. - MAC-S is verified with MAC-S', where MAC-S' = f1*K(SQNMS || RAND || AMF). It means MAC-S is one of the inputs to retrieve SQNMS. SQNMS is one of the inputs to verify MAC-S. The home network knows whether to use MAC-S to calculate AK based on the subscription identifier, e.g. IMSI or SUPI.
description: MAC-S (Resynchronisation Authentication Code) is a critical parameter used in the 5G network's authentication process. It is utilized to retrieve and verify SQNMS, which is essential for calculating AK and ensuring secure communication.
explanation: MAC-S is directly involved in the authentication process by being used to retrieve and verify SQNMS, a key component for generating AK (Authentication Key) and securing communication. This clearly classifies it as an authentication parameter.
section_title: 6.4.1.2	Solution details
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biotag_Description: B-Parameter,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O