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Mark Andrews wrote:
>       It's not a issue.  You remove the DS's which have that
>       algorithm then once they have expired from caches you can
>       remove the DNSKEY.

That could still leave the zone itself in an inconsistent state... I'm
not talking about the DS<->child apex case, but the apex<->zone data case.

The DNSKEY that is removed or added doesn't have to be one that is
pointed to by a DS. Merely being present in the apex implies that there
should be signatures of that algorithm in the zone.

If you don't add/remove all keys at the same time, the first or last
DNSKEY couldn't even be a KSK; since those keys aren't used to sign the
zone data, having a KSK as the only key of a certain algorithm number
would always violate section 2.2.

Unless of course I am misreading that MUST there :)

Jelte
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