I still don't understand why this implies the need for regular changes
as opposed
to changes triggered by personnel changes.

-Ekr


On Thu, Jan 21, 2010 at 10:03 AM, Paul Wouters <p...@xelerance.com> wrote:
> On Thu, 21 Jan 2010, Edward Lewis wrote:
>
>> If I were to fit this into the text below...
>>
>> #<t>
>> #        The motivation for having the KSK's effectivity period
>> #        longer than the ZSK's effectivity period is rooted in the
>> #        operational consideration that a change in the KSK involves
>> #        interaction with an external entity, usually the parent zone
>> #        or possibly a trust anchor repository, and this interaction
>> #        is anticipated to have significant latency (including the
>> #        need to verify the other party has made the necessary change.
>> #</t>
>
> Maybe make it more explicit that an intra-organisation key change can
> and probably should happen frequently, where-as an inter-organisational
> key change, because it involves other organisations, is more difficult
> and should be kept to a minimum?
>
> Again, think of a zone administrator who had access to a private ZSK
> leaving your organisation. It would be a good security policy to rollover
> the ZSK as part of the procedure of revoking this person's access to
> the organisation. And a good reason to have an HSM so you do not need
> to do the same with the KSK.
>
> Paul
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