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Which key in the PTK protects the confidentiality of keys and data during RSN associated procedure?

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Which key in the PTK protects the confidentiality of keys and data during RSN associated procedure?

(a) EAPOL KCK

(b) EAPOL KEK

(c) TK

(d) All of the mentioned

I have been asked this question in an interview for internship.

Asked question is from IEEE 802.11i WLAN Security topic in division Wireless Network Security and Network Security Overview of Cryptograph & Network Security

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The correct answer is (b) EAPOL KEK

For explanation I would say: This is the function of the EAPOL Key Encryption Key.

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