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What is the purpose of the AUTN field used in UMTS authentication? Do the MAC and AUTN authenticate the keys CK and IK? How is

What is the purpose of the AUTN field used in UMTS authentication? Do the MAC and AUTN authenticate the keys CK and IK? How is the freshness of CK and IK ensured?

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The AUTHENTICATION TOKEN is sent in the Authentication Request message to the versatile alongside an ... blur-text-image

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