This article describes how to utilise the Network Time Protocol authentication features to authenticate time references when synchronizing clients to a NTP server.NTP Server SecurityNetwork Time Protocol is used to provide a precise time reference for time critical applications.
Therefore, NTP can pose a security risk if malicious users attempt to corrupt a NTP timestamp to create a false time on network equipment.NTP provides increased security in the form of authentication. Authentication is intended to overcome security risks by ensuring that any response received from an NTP time server has come from the intended reference. The client sends a request for time to a NTP server.
The server then responds to the client with a precise timestamp along with one of a number of agreed encrypted keys. On receipt of the timestamp, the client un-encrypts the key and verifies it against a list of trusted keys. The client can then be sure that the received timestamp was indeed transmitted from the intended time reference.
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