Question: Describe in details the user authentication function in the USIM with definition of each element involved and its role (SQN, AK, MAC, f1,). User Authentication

Describe in details the user authentication function in the USIM with definition of each element involved and its role (SQN, AK, MAC, f1,).

User Authentication Function in the USIM RAND AUTN SON AK MAC AMF f5 AK SQN fl f2 f3 f4 XMAC (Expected MAC) RES (Result) CK (Cipher Key) IK (Integrity Key . Verify MAC XMAC .Verify that SQN is in the correct range USIM: User Services Identity Module User Authentication Function in the USIM RAND AUTN SON AK MAC AMF f5 AK SQN fl f2 f3 f4 XMAC (Expected MAC) RES (Result) CK (Cipher Key) IK (Integrity Key . Verify MAC XMAC .Verify that SQN is in the correct range USIM: User Services Identity Module

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