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Doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 1 Improved CCMP PN Usage Mark Matson

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Presentation on theme: "Doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 1 Improved CCMP PN Usage Mark Matson"— Presentation transcript:

1 doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 1 Improved CCMP PN Usage Mark Matson mmatson@broadcom.com David Johnston david.johnston@ieee.org

2 doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 2 Problem CCMP Packet Number Ordering Is Inconsistent: –Broadcast order changed to LS (octet 0) first –MIC and CTR usage remained MS first –Early specs didn’t show byte reversal –During reception, hardware implementation must buffer and reverse this one field only –Increased complexity

3 doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 3 Solution Insert PN into MIC_IV and CTR_PRELOAD in the same order it’s broadcast (octet 0 first) Maintains security –Satisfies NIST CCM nonce requirements –PN field remains unique for each packet –PN still available to facilitate replay detection

4 doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 4 Packet Number Is Broadcast and Received As PN0-5

5 doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 5 Use in CTR_PRELOAD in Same Order

6 doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 6 Use in MIC_IV in Same Order

7 doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 7 The Text Document 12-02-xxxr0 contains text and instructions to the editor for making changes to section 8.3.4 and its subsections. Changes are with respect to D3.0 of TGi spec.

8 doc.: IEEE 802.11-02/611r6 Submission December. 2002 Mark Matson, Broadcom; David Johnston, Mobilian.Slide 8 Motion Instruct the editor to incorporate into the draft the changes described in document 11- 02-xxxr1

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