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In CCMP a 128-bit AES Key is used for both integrity and confidentiality. The scheme uses a ___________ bit packet number to construct a nonce to prevent __________ attacks.

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In CCMP a 128-bit AES Key is used for both integrity and confidentiality. The scheme uses a ___________ bit packet number to construct a nonce to prevent __________ attacks.

(a) 48, replay

(b) 64, replay

(c) 48, transient

(d) 64, transient

The question was asked in an interview for internship.

I would like to ask this question from IEEE 802.11i WLAN Security in chapter Wireless Network Security and Network Security Overview of Cryptograph & Network Security

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Correct answer is (a) 48, replay

Explanation: The scheme uses a 48-bit packet number to construct a nonce to prevent replay attacks.

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