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CCMP MIC Processing

CCMP MIC Processing. Paul Lambert. Overview. CCM Algorithm is based on AES and provides integrity (CBC mode) and confidentiality (CTR mode encryption) CCMP is the IEEE 802.11 TGi format and processing that defines how .11 MPDU fields are processed in CCM

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CCMP MIC Processing

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  1. CCMP MIC Processing Paul Lambert Paul Lambert, Airgo Networks, Inc.

  2. Overview • CCM Algorithm is based on AES and provides integrity (CBC mode) and confidentiality (CTR mode encryption) • CCMP is the IEEE 802.11 TGi format and processing that defines how .11 MPDU fields are processed in CCM • Integrity processing is intended to be on all ‘invariant’ .11 fields Paul Lambert, Airgo Networks, Inc.

  3. Invariant Fields • CCMP processing is once per MPDU • Retransmitted MPDUs should NOT repeat cryptographic processing • Able to retransmit original MPDU • Integrity processing can NOT include fieldsthat change on retransmission Paul Lambert, Airgo Networks, Inc.

  4. Current CCMP Muting • CCMP ‘mutes’ fields so that hey are not part of the integrity processing. • Current (draft 2.3) muted CCMP fields: • Duration • Retry Paul Lambert, Airgo Networks, Inc.

  5. Complete Analysis of 802.11 fields for invariance of MIC calculation Paul Lambert, Airgo Networks, Inc.

  6. CCMP Muting Requirements • The following CCMP fields must be muted: • Duration • Retry • More Data • Pwr Mgt • QoS-TXOP/QueueLength, FEC, Ack Policy Paul Lambert, Airgo Networks, Inc.

  7. Motion • The CCMP integrity processing in the current Tgi draft shall be modified to mask to zero the ‘Pwr Mgt’, ‘More Data’ and ‘QC bits 4 to 15’ for purposes of the CBC integrity calculation. Paul Lambert, Airgo Networks, Inc.

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