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When the NTP client initiates a request for time services to the NTP server, it creates the MAC by using the agreed upon algorithm to compress the message and then encrypts the compressed message (which is also called a message digest) with the secret key. The client appends the MAC to the message it sends to the NTP server. When the NTP server receives the message from the client, it performs the same procedure on the message — it compresses the message it received, encrypts it with the secret key and generates the MAC. It then compares the MAC it created with the MAC it received. If they match, the server continues to process and respond to the message. If the MACs do not match, the receiver drops the message.
Figure 8.2 NTP Client Administrator Obtaining Secret Key from NTP Server Administrator ...
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NIOS Appliances as NTP Clients
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