name: SMC
full_form: Security Mode Command
context: 4. If NAS integrity verification fails, UE sends NAS SMC Reject message carrying IWF SMC Reject message to MME, MME forwards the IWF SMC Reject message to MTC-IWF. 5. If NAS integrity verification is successful, UE derives K_iwf and subkeys. UE uses the Kasme indicated by the eKSI in NAS Security Mode Command. 6. UE performs integrity verification on the IWF SMC, using the integrity subkey derived by UE. 7. UE sends the NAS SMC Complete carrying IWF SMC Complete to MME, IWF SMC Complete message can be integrity protected. 8. Or UE sends IWF SMC Reject message carried in NAS SMC Complete, if the verification in Step 6 fails. Or MME forwards the IWF SMC Complete or IWF SMC Reject message to MTC-IWF. 9. MTC-IWF can perform integrity verification on the IWF SMC Complete message. 10. Security association is established between UE and MTC-IWF and they can start secure communication. If MTC-IWF received IWF SMC Complete, and integrity verification is passed at Step 9 (when it is carried). If
description: The Security Mode Command (SMC) is a type of message used in the NAS protocol to establish security associations between the UE and the MTC-IWF. It carries information necessary for integrity verification and key derivation.
explanation: The text explicitly states that SMC is a 'type of message' used in the NAS protocol, indicating its role as a communication element.
section_title: 5.7.4.4.4	Detailed Solution
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biotag_Description: O,B-Message,I-Message,I-Message,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O