trusted ntp servers

tikit · 06-02-2009, 07:16 AM

Hi,

We use public ntp servers for time sychronization in our company. To enhance security, we would like to use ntp authentication.
The problem is, I can not find any public ntp server providing its authentication key.
Is there a list on the Internet where I can find such servers?

Thanks for your help.

bsdunix · 06-02-2009, 08:17 AM

You probably have to request a key from the site managing the authenticated NTP server.

I didn't find a list of only authenticated NTP servers. If you click on the server's hostname hyperlink on these lists it will tell you the "AccessDetails" if that server offers authenticated NTP service.

http://support.ntp.org/bin/view/Serv...BoulderNistGov
http://support.ntp.org/bin/view/Serv...TwoTimeServers

Example server:

http://support.ntp.org/bin/view/Serv...BoulderNistGov

Authenticated NTP service using symmetric keys. Users must register with NIST.

Instructions for using the NIST authenticated Network Time Protocol (NTP) server
http://tf.nist.gov/service/pdf/ntp_instructions.pdf

tikit · 06-02-2009, 09:22 AM

thanks for your answer. I also found that it is possible to use "public key cryptography" but I did not find any ntp server providing autokey capability.