NTP has public and private keys. http://doc.ntp.org/4.1.0/genkeys.htm Just like SSL, gpg, etc.
Of course ntp.ubuntu.com and other server owners keep their private key secure. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to ntp in Ubuntu. https://bugs.launchpad.net/bugs/1039420 Title: NTP security vulnerability because not using authentication by default To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/1039420/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs