"NTS RFC Published: New Standard to Ensure Secure Time on the Internet" (2020) https://www.internetsociety.org/blog/2020/10/nts-rfc-publish... :
> NTS is basically two loosely coupled sub-protocols that together add security to NTP. NTS Key Exchange (NTS-KE) is based on TLS 1.3 and performs the initial authentication of the server and exchanges security tokens with the client. The NTP client then uses these tokens in NTP extension fields for authentication and integrity checking of the NTP protocol messages that exchange time information.
From "Simple Precision Time Protocol at Meta" https://news.ycombinator.com/item?id=39306209 :
> How does SPTP compare to CERN's WhiteRabbit, which is built on PTP [and NTP NTS]?
White Rabbit Project: https://en.wikipedia.org/wiki/White_Rabbit_Project