On Sat, 8 Feb 2014, Mukund Sivaraman wrote:

Did you see my reply to your email a few weeks ago where I asked why new
CDS/CDNSKEY RR types are required instead of adding a new bit to the
Flags field of the DNSKEY RR.

That does not allow prepublishing of DS records for DNSKEY's not
published in the zone yet, which is a strategy for publishing an
emergency rollover key at the parent in case of a compromise of
the signer. This key can be completely offline and even the public
key part unknown to any party.

Paul
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