
•
IV (initialization vector). Initialization vector with a block of bits concate-
nated with the block of main data used for decrypting frames. The IV is
reinitialized after each use. The combination of IV and data creates a unique
encryption key.
•
EKS (encryption key select). Index used to retrieve the NEK used for frame
decryption.
Format of Control and Management Frames
The purpose of control and management frames is to send supervision information
and commands to the network elements that need them in order to operate.
As illustrated in Figure 5.18, information concerning the frame length and
response expected by the source station is used to manage and control the frames
(see Chapter 3).
Some manufacturers of PLC products implement specific MAC layers to make
it easier to manage and control the networks.
MAC Layer Frames 103
Figure 5.17 Encrypted HomePlug 1.0 MAC frame details
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