[ntp:questions] Re: server's address in ntp payload?

David L. Mills mills at udel.edu
Sat Nov 19 15:12:17 UTC 2005


The server private value need not and is not divulged. It is hidden by 
the hash operation, just as in very many other protocols. I don't know 
why we are having this discussion, as the issues at hand are common with 
other secret schemes. See the Autokey briefings on protocols and 
identity schemes at www.eecis.udel.edu/~mills/ntp.html.


David Schwartz wrote:

> "David L. Mills" <mills at udel.edu> wrote in message 
> news:dllhoh$4e3$1 at dewey.udel.edu...
>>That's what the server private seed is for. It is never divulged.
>     If it's never divulged, how can you use it to tell you who sent you the 
> packet?
>     For example, suppose I have two servers, A and B. A is talking to a 
> third server C. I wish to determine if a server B is talking to is that same 
> server C, or a distinct server, D. How will a session hash help me do that? 
> On the other hand, a public server ID that is globally unique *will* help me 
> do that. The source IP won't, because a single machine can have multiple 
> addresses.
>     DS

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