User guide

7-22
BreezeNET DS.11b User’s Guide
Manual Version 1.0
Table 7-4 : Single Key - No Transition
By initially configuring all stations with the keys for the first 4 periods, only the
Txkey index needs to be changed at all stations for the first three steps. At the
step from period 3 to period 4, the keys have to be changed at all STAs as well.
Single Key – Transition Period
To introduce a transition period between the main life of the successive keys,
the scheme has to be changed as shown in Table 7-5.
Table 7-5 :Single Key - Transition Period
Notice that in the transition periods 1, 3 and 5 the end users can switch over
from one Txkey index to the next. At the end of this period, all stations must be
over to the new key index. Transition period 7 includes the transition to a new
set of keys as well. The total length of time a key is used consists here of the
main life time period and two transition periods. Assuming the main life is much
Period AP Configuration Outward STA Configuration(s) Inward
# Description Keys 1-2-3-4 Tx Key Keys 1-2-3-4 Tx Key
0 Main life
key A
A-0-0-0 1 A A-B-C-D 1 A
1 Main life
key B
0-B-0-0 2 B = 2 B
2 Main life
key C
0-0-C-0 3 C = 3 C
3 Main life
key D
0-0-0-D 4 D = 4 D
4 Main life
key E
E-0-0-0 1 E E-F-G-H 1 E
5 Main life
key F
0-F-0-0 2 F = 2 F
Period AP Configuration Out-
ward
STA
Configuration(s)
In-ward
# Description Keys 1-2-3-4 Tx Key Keys 1-2-3-4 Tx Key
0 Main life key A A-0-0-0 1 A A-B-C-D 1 A
1 Transition A-B A-B-0-0 2 B = 1|2 A | B
2 Main life key B 0-B-0-0 2 B = 2 B
3 Transition B-C 0-B-C-0 3 C = 2|3 B | C
4 Main life key C 0-0-C-0 3 C = 3 C
5 Transition C-D 0-0-C-D 4 D = 3|4 C | D
6 Main life key D 0-0-0-D 4 D = 4 D
7 Transition D-E E-0-0-D 1 E A-B-C-D
E-F-G-H
4
1
D
E
8 Main life key E E-0-0-0 1 E E-F-G-H 1 E
9 Transition E-F E-F-0-0 2 F = 1|2 E | F