Medium Access Control (MAC) and Physical Layer (PHY) - CISE

4-June-07 P1901_PRO_016_r0
The Nonce shall be the following fields:
Figure 142: Nonce Structure
- Nonce priority – 8 bits. This field is different from the priority field in the burst header and is for future
capability. The Nonce Priority Octet field shall be 0 and is reserved for future use.
- Source Address – 48 bits. It is taken from the MAC address of the transmitter included in the Token
Announce (Section 4.4.1).
- PN – 48 bits. It is calculated adding to the PN of the CCMP Header the number of the first packet or
fragment of packet of the Burst minus one.
This Nonce is used to produce two 128-bit words: B0 and A0 (IETF RFC 3610 and NIST 800-38c).
The initial CCMP block B0 (128-bit block), needed for the calculation of the MIC, has the following fields:
- Flag B0 – 8 bits. Fix content (IETF RFC 3610 and and NIST 800-38c). It indicates that the MIC is 32 bits
long. See Table 58.
- Nonce – 104 bits. See Figure 142
- DLen – 16 bits. Length in bytes of the data to be encrypted. The DLen is the taken from the Length field of
the Inter Packet Header (Figure 58).
Submission page 283 UPA-OPERA