Re: Quic: the elephant in the room

Nico Williams <nico@cryptonector.com> Mon, 12 April 2021 02:59 UTC

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Date: Sun, 11 Apr 2021 21:59:32 -0500
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From: Nico Williams <nico@cryptonector.com>
To: "Salz, Rich" <rsalz@akamai.com>
Cc: IETF Discussion Mailing List <ietf@ietf.org>
Subject: Re: Quic: the elephant in the room
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On Mon, Apr 12, 2021 at 01:54:23AM +0000, Salz, Rich wrote:
> >    You publish TLSA RRs for the new one and after the switch you delete the
>     ones for the old one.  You can have more than one TLSA RR in a TLSA
>     RRset.
> 
> Thanks for the explanation.  I don't know enough DNSSEC to know if
> that's actually deployable, but okay

You can tune down TTLs before the change, etc.

Perhaps there is room for a certificate extension that says "invalidate
cached TLSA RRs cached before this $timestamp" (the timestamp might even
be the certificate's notBefore).  Then there would be no need to tune
down TTLs.

Nico
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