Hi Stephen,

ECH-09 is meant to use HPKE-07, as declared in the body:
https://www.ietf.org/archive/id/draft-ietf-tls-esni-09.html#name-encrypted-clienthello-confi

Although it looks the draft didn't get updated in the references somehow:

[I-D.irtf-cfrg-hpke] Barnes, R., Bhargavan, K., Lipp, B., and C. Wood, "Hybrid
Public Key Encryption", Work in Progress, Internet-Draft,
draft-irtf-cfrg-hpke-06, 23 October 2020, <
http://www.ietf.org/internet-drafts/draft-irtf-cfrg-hpke-06.txt
<https://www.ietf.org/internet-drafts/draft-irtf-cfrg-hpke-06.txt>>.

Also, +1 for targeting ECH-09 for interop!

Chris P.

On Wed, Dec 16, 2020 at 8:13 AM Stephen Farrell <stephen.farr...@cs.tcd.ie>
wrote:

>
> Hiya,
>
> I'd like it were this version to be aiming to be for
> interop. But it refers to hpke-06 when hpke-07 was
> published ~90 minutess before this.
>
> So, if we do want interop for this, I guess it'd be
> best to push out -10 before the holidays with a ref
> to hpke-07? Or to just declare that the interop target
> is esni-09 with hpke-07? Or, are we not aiming for
> interop still?
>
> S.
>
> On 16/12/2020 16:02, internet-dra...@ietf.org wrote:
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> > This draft is a work item of the Transport Layer Security WG of the IETF.
> >
> >          Title           : TLS Encrypted Client Hello
> >          Authors         : Eric Rescorla
> >                            Kazuho Oku
> >                            Nick Sullivan
> >                            Christopher A. Wood
> >       Filename        : draft-ietf-tls-esni-09.txt
> >       Pages           : 40
> >       Date            : 2020-12-16
> >
> > Abstract:
> >     This document describes a mechanism in Transport Layer Security (TLS)
> >     for encrypting a ClientHello message under a server public key.
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-tls-esni/
> >
> > There is also an HTML version available at:
> > https://www.ietf.org/archive/id/draft-ietf-tls-esni-09.html
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-tls-esni-09
> >
> >
> > Please note that it may take a couple of minutes from the time of
> submission
> > until the htmlized version and diff are available at tools.ietf.org.
> >
> > Internet-Drafts are also available by anonymous FTP at:
> > ftp://ftp.ietf.org/internet-drafts/
> >
> >
> > _______________________________________________
> > TLS mailing list
> > TLS@ietf.org
> > https://www.ietf.org/mailman/listinfo/tls
> >
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>
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