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Re: [DNSOP] [Ext] Call for Adoption: draft-hoffman-dnssec-iana-cons

Eric Rescorla <ekr@rtfm.com> Wed, 06 January 2021 22:33 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 06 Jan 2021 14:33:10 -0800
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To: Paul Wouters <paul@nohats.ca>
Cc: Paul Hoffman <paul.hoffman@icann.org>, dnsop <dnsop@ietf.org>
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Subject: Re: [DNSOP] [Ext] Call for Adoption: draft-hoffman-dnssec-iana-cons
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On Wed, Jan 6, 2021 at 2:15 PM Paul Wouters <paul@nohats.ca> wrote:

> On Jan 6, 2021, at 17:01, Eric Rescorla <ekr@rtfm.com> wrote:
> >
> >
> > This is not strictly correct: TLS allows both the client and the server
> to advertise their supported signature algorithms, which can be used by the
> peer to guide certificate selection.
>
> How common is it for TLS servers to have multiple signature algorithm /
> certificates configured to support this?
>

I don't have measurements for this offhand. It typically happens during
periods of transition, for instance between SHA-1 and SHA-256. I believe we
also saw it when servers had certificates with both RSA and EC keys.

-Ekr

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