1. Clarified CCM Diagrams
November. 2002
Clarified CCM Diagrams
David Johnston
David Johnston, Mobilian.

2. November. 2002
Problem
CCM Text in current TGi draft D2.3 fail to adequately describe:
data path widths
Padding operations
Construction of IV and header fields
Bit level behaviour of CCM algorithm
David Johnston, Mobilian.

3. November. 2002
Solution
Include complete CCM encryption and decryption algorithm data flow diagrams
For clarity, break out the construction of the 4 initialization blocks into separate diagrams
MIC_IV, first MIC header block
MIC_HEADER1, second MIC header block
MIC_HEADER2, third MIC header block
CTR_PRELOAD(i), encryption and decryption counter nonce
David Johnston, Mobilian.

4. Solution - Continued Correct bit map of CCM ctr flag field
November. 2002
Solution - Continued
Correct bit map of CCM ctr flag field
not
Rename RSN Header bytes in the CCM encapsulation diagram to be names PN0 through to PN5, corresponding to the lsb through to the msb of the PN bytes respectively.
Make clear that HLEN is length of muted header
Make clear that protected bit is set in IV
David Johnston, Mobilian.

5. November. 2002
Solution – Continued - 2
Provide octet index in tables describing initialization block construction
Brings into sync with diagrams in the NIST CCM Specifications.
Disambiguates endianess
David Johnston, Mobilian.

6. Concerning 802 MAC Addresses
November. 2002
Concerning 802 MAC Addresses
802 Does not specify a MAC address with bits 47-0
There are octets 0-5. Octet 0 is written on the left
00-E E-77 :
Octet: 1 2 3 4 5
Value: 00 E0 63 82 8E 77
Must not use colons! Implies bit reversal within bytes
Therefore
Avoid colons
Refer to octets 0-5
Do not refer to bits 47-0
David Johnston, Mobilian.

7. Information Represented
November. 2002
Information Represented
Data Path Widths within CCM algorithm
Ordering of bytes within initialization block fields
Position of padding operations
Unambiguous construction of initialization blocks
David Johnston, Mobilian.

8. CCM Encapsulation Process
November. 2002
CCM Encapsulation Process
David Johnston, Mobilian.

9. CCM Decapsulation Process
November. 2002
CCM Decapsulation Process
David Johnston, Mobilian.

10. November. 2002
CCM Encapsulation
David Johnston, Mobilian.

11. November. 2002
CTR_PRELOAD(C)
David Johnston, Mobilian.

12. November. 2002
CCM Encryption
David Johnston, Mobilian.

13. CCM Decryption Diagram
November. 2002
CCM Decryption Diagram
David Johnston, Mobilian.

14. November. 2002
MIC_IV Diagram
David Johnston, Mobilian.

15. November. 2002
MIC_HEADER1 Diagram
David Johnston, Mobilian.

16. November. 2002
MIC_HEADER2 Diagram
David Johnston, Mobilian.

17. November. 2002
CCM MIC
David Johnston, Mobilian.

18. November. 2002
The Text
Document r6 contains text and instructions to the editor to make changes to section and its subsections.
Changes are with respect to D2.5 of TGi spec.
David Johnston, Mobilian.

19. November. 2002
Motion
Instruct the editor to incorporate into the draft the changes described in document r6
David Johnston, Mobilian.