From the reference Link:
Cisco strongly recommends that you use the security features of NTP to avoid the accidental or malicious setting of incorrect time. Two mechanisms are available: an access list-based restriction scheme and an encrypted authentication mechanism.
"The two security features available are an access list-based restriction scheme and an encrypted authentication mechanism"
https://www.cisco.com/c/en/us/support/docs/availability/high-availability/19643-ntpm.html
The time kept on a machine is a critical resource, so Cisco strongly recommends that you use the security features of NTP to avoid the accidental or malicious setting of incorrect time.
Two mechanisms are available: an access list-based restriction scheme and an encrypted authentication mechanism.
cisco(config)#ntp ?
access-group Control NTP access
allow Allow processing of packets
authenticate Authenticate time sources
authentication-key Authentication key for trusted time sources
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