By configuring the authentication key ID used in the synchronization with the NTP broadcast server on the local FW, you can apply NTP authentication in broadcast mode.
Do as follows on the FW that functions as an NTP broadcast server. For configuring the broadcast client, see Configuring the Broadcast Mode.
system-view
interface interface-type interface-number
ntp-service broadcast-server [ version number | [ authentication-keyid key-id | autokey ] | port port-number ] *