x-pve Any news about this topic? It's still not possible to use standard NTP protocol?
The answer given by the GrapheneOS project two years ago earlier in this thread (GrapheneOS) was that the project did not want to ship NTP without NTS and that AOSP did not include an implementation of NTS.
If there is news that the AOSP implementation of NTP now includes NTS, that would likely be welcome news. Or if a member of the community chose to contribute an implementation of NTS, and it were of high enough quality, that might change the situation.
But personally it doesn't seem very likely to me that the GrapheneOS project will suddenly decide to ship an NTP client without a way to secure the time, because running a device's time in reverse can enable replay attacks, and the project does not typically add low-security solutions when higher-security solutions exist.
Please note that I do not speak for the GrapheneOS project.