Given: When the CCMP cipher suite is used for protection of data frames, 16 bytes of overhead are added to the Layer 2 frame. 8 of these bytes comprise the MIC.
What purpose does the encrypted MIC play in protecting the data frame?
A.
The MIC is used as a first layer of validation to ensure that the wireless receiver does not incorrectly process corrupted signals.
B.
The MIC provides for a cryptographic integrity check against the data payload to ensure that it matches the original transmitted data.
C.
The MIC is a hash computation performed by the receiver against the MAC header to detect replay attacks prior to processing the encrypted payload.
D.
The MIC is a random value generated during the 4-way handshake and is used for key mixing to enhance the strength of the derived PTK.
A cryptographic checksum applied to the data payload.
It ensures the payload was not modified in transit and guards against tampering.
With AES-CCMP, the MIC is generated as part of the encryption process and verified upon decryption.
Incorrect:
A. Signal integrity is validated at the physical layer, not through the MIC.
C. The MIC protects data payload integrity, not just MAC headers.
D. The MIC is not generated during the 4-Way Handshake.
[References:, , CWSP-208 Study Guide, Chapter 3 (CCMP and Frame Protection), , IEEE 802.11i-2004 Specification, ]
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