Trying a DNSSEC zone signing key (ZSK) rollover / 2021-07-03

2021-07-03 Trying a DNSSEC zone signing key (ZSK) rollover 2 weeks ago
Time to do a zone signing key (ZSK) rollover. That rollover is relatively easy because I don't need to synchronize it with the DS key in the parent zone.

I generated a 'successor' key for camp-wireless.com and set a short-notice publication date. The old ZSK has keytag 02908 and the new one has keytag 25619. There is an overlap of a month in which both keys are seen as valid because caching of DNS answers mean there can be signatures created with the old ZSK in caches.

Generating a signed zone after the validity of the new ZSK has started shows both ZSKs signed as valid. Old and new zone signing key:
; This is a zone-signing key, keyid 2908, for camp-wireless.com.
; Created: 20190704113915 (Thu Jul  4 13:39:15 2019)
; Publish: 20190704113915 (Thu Jul  4 13:39:15 2019)
; Activate: 20190704113915 (Thu Jul  4 13:39:15 2019)
; Inactive: 20210705000000 (Mon Jul  5 02:00:00 2021)
; Delete: 20210805000000 (Thu Aug  5 02:00:00 2021)
camp-wireless.com. IN DNSKEY 256 3 13 lXntnbvQqHy+OSG/2RpHEbcYzeUAB2tFE+d5Us9M07Ndw7TI2DF2TIDx vC3bPomCE2102FJSr8/DnzoRiMHreg==
; This is a zone-signing key, keyid 25619, for camp-wireless.com.
; Created: 20210702115321 (Fri Jul  2 13:53:21 2021)
; Publish: 20210703000000 (Sat Jul  3 02:00:00 2021)
; Activate: 20210705000000 (Mon Jul  5 02:00:00 2021)
camp-wireless.com. IN DNSKEY 256 3 13 kJpmrljuP7PncZij7G1Yn9xngKe1xUpuONG2XAx8AYXu//qXClAbgg3B bmzyeDpFAw2gDRhjQ7f5o20c1QK9OA==
So I generated the key on 2 July 2021, with a set publication date of 3 July 2021. I shortened the prepublication period to avoid problems with other things happening in the near future and today it changed to published. If I generate new signatures again on 5 July 2021 those will use the new key.

DNSSEC is a process with lots of things to get your brains around, and a key rollover is one of those things. A key signing key rollover is even harder because uploading of the public key to the registrar has to be kept synchronized with the published information. That is why I am testing all this on camp-wireless.com where it is not a major problem if something fails.

Reports at dnsviz of the changeover: And yes there are warnings for the delegation from the hashing algorithm used for the DS record in the .com zone. I checked with my registrar and they are aware of the fact that SHA-1 records give warnings and are working on upgrading to SHA-256.

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