name: NSUC
full_form: Network Security Use Counter
context: receives the initial attach request, MME distributes public key(optional next key) and the corresponding public key ID(s), CBE ID, and NSUC for the current key in NAS SMC messages. UE receives and saves the public key(s), CBE ID(s), NSUC and public key ID(s). When UE receives warning messages, UE verifies the signature of PWS Warning Notification message with public key, NSUC and the signature algorithm. The signature covers emergency warning, and NSUC. UE verifies that NSUC received from the network in the notification is greater or equal to the NSUC stored on the UE. After receiving a warning message, the UE ceases to update its stored NSUC that is associated with this signing key. NOTE: if there are too few bits to actually send the NSUC over the air in the warning message, it could be left out. Then the UE would need to test the potential NSUCs starting from the stored NSUC to the stored NSUC plus a window size. The signature will always have to cover both the warning message and
description: Network Security Use Counter (NSUC) is a parameter used in network security mechanisms, specifically for public key distribution and verification of warning messages in the context of Public Warning Systems (PWS). It ensures that the UE verifies the signature of PWS Warning Notification messages with the correct public key and NSUC.
explanation: The provided text explicitly states that NSUC is a parameter used for security purposes, particularly in verifying warning messages within Public Warning Systems. This aligns with the definition of a Parameter as a configurable value that influences network behavior.
section_title: 7.3.2.1	Initial PWS public key distribution
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