Since NTP is being discussed. There is now a new RFC specifying NTS - Network Time Security for NTP: https://datatracker.ietf.org/doc/html/rfc8915 https://data

Since NTP is being discussed. There is now a new RFC specifying NTS - Network Time Security for NTP: https://datatracker.ietf.org/doc/html/rfc8915 https://datatracker.ietf.org/doc/html/rfc8915 Chrony mentioned earlier here supports NTS. There are public servers supporting NTS, for example: https://www.netnod.se/time-and-frequency/how-to-use-nts https://www.netnod.se/time-and-frequency/how-to-use-nts