[ntp:questions] Re: Secure W32Time

Danny Mayer mayer at ntp.isc.org
Tue Mar 21 13:47:15 UTC 2006

malayter at gmail.com wrote:
> According to:
> http://tinyurl.com/ft435
>   and
> http://tinyurl.com/fh8uz
> In Windows 2003 SP1 and later, a full NTPv3 implementation with NTPv4
> algoritmic enhancements is used. Windows Time Service is apparently no
> longer just SNTP, at least on the servier side.
> However, it appears the only Windows servers in the same domain can
> share authenticated time (they use their existing Kerberos session keys
> as a shared secret). There does not seem to be a way to configure the
> Windows Time Service to use a specific pre-shared key with a
> manually-defined server.  I base this on a the list of command-line
> switches and registry settings provided in the links above. There may
> be undocumented ways of accomplishing this with Windows Time. This
> omission appears to be "okay" as far as NTP standards are concerned,
> because authentication is an optional part of RFC-1305 and RFC-2030.

I skimmed through the first reference and was amused to see that it was
using Kerberos session keys for authentication. However, Kerberos is
time dependent.... Can you say chicken and egg?


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