Re: [ntpwg] Fwd: Early Allocations for NTS drafts from the IETF NTP Working Group

[Kurt Roeckx <[e-mail]>]

On Mon, Mar 14, 2016 at 03:06:44PM -0700, Hal Murray wrote:
>
> If I have symmetric keys, why would I bother with NTS?
>
> Is there some crypto argument about changing keys after using a
> key on X
> bytes of data?

As far as I know, it depends on how you use that key, but I would
say yes.

Even if it doesn't depend on it, it might still be a good idea to
replace it on regular basis.

> If so, what is X

I think here the answer is even more complicated.

> how does that translate to something like years of NTP traffic?

Depending on how you use the key, it might not relate to the NTP
traffic.  That is, the key used for the NTP traffic might not be
the same.

If you want more specific answers you should ask more specific
questions, including on how you intend to use it.  And you should
probably ask someone who knows more about such things.

I also have no idea if there has been a real study of the proposal
or not, and I would strongly suggest that happens.


Kurt

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