name: SN
full_form: Serving Network
context: The MN shall maintain a 16-bit counter, SN Counter, in its AS security context. The SN Counter is used when computing the KSN. The MN maintains the value of the counter SN Counter for a duration of the current 5G AS security context between UE and MN. The UE does not need to maintain the SN Counter after it has computed the KSN since the MN provides the UE with the current SN Counter value when the UE needs to compute a new KSN. The SN Counter is a fresh input to KSN derivation. That is, the UE assumes that the MN provides a fresh SN Counter each time and does not need to verify the freshness of the SN Counter. NOTE: An attacker cannot, over the air modify the SN Counter and force re-use of the same SN Counter. The reason for this is that the SN Counter is delivered over the RRC connection between the MN and the UE, and this connection is both integrity protected and protected from replay. The MN shall set the SN Counter to â0â when a new AS root key, KNG-RAN, in the associated 5G AS
description: The Serving Network (SN) Counter is a 16-bit parameter maintained by the Mobile Node (MN) in its Access Stratum (AS) security context. It is used to compute the Key Security Nonce (KSN) and is provided by the MN to the User Equipment (UE) when needed.
explanation: The SN Counter is classified as a Parameter because it is a critical network attribute for operation, specifically in the computation of the KSN and maintenance of the AS security context between the UE and MN.
section_title: 6.10.3.1	SN Counter maintenance
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biotag_Description: O,B-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,B-Network Function,O,O,B-Device,I-Device,O,O,O