Hiya,

Quite a while back, I asked about adoption of [1]
which defines a PEM file format for ECH stuff. IIRC
the reactions varied from "maybe later" to "goto ISE."

As of now, that format is used by code in the OpenSSL
ECH "feature branch" [2], lighttpd [3], apache httpd [4]
and a patch for freenginx [5]. (I was partly responsible
for [2,3,4] but in each case maintainers have merged
PRs for this; [5] was independently done by the maintainer
of that package).

Of those, IIUC, only the lighttpd code has been part of
a release, but is marked as experimental. All going well,
the others will release versions that use this format
in the coming months, so if changes were useful then now
is a fine time to make those.

So I figure it's no harm to ask again if adopting [1]
is something the WG would like to consider. I don't
mind if the answer is "goto ISE" but if so would love
to be able to say to the ISE that the TLS WG had a look
and are ok with taking that route.

Even better would be to get adoption/review from the
WG that could feed into implementations before those
are released. (That does of course assume the WG
process this relatively quickly before those releases
happen:-)

This could well be suited for a 5 minute slot at the
upcoming TLS session in Montreal, or given that [1] is
pretty straightforward, maybe the chairs could get it
processed on the list before then.

Thanks,
S.

[1] https://datatracker.ietf.org/doc/draft-farrell-tls-pemesni/
[2] https://github.com/openssl/openssl/tree/feature/ech
[3] https://redmine.lighttpd.net/projects/lighttpd/wiki/TLS_ECH
[4] https://github.com/apache/httpd/commit/0c9cd095ce9081fd225f0da7787419e80de7c701
[5] https://freenginx.org/pipermail/nginx-devel/2025-September/000771.html

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