[TLS] draft-sullivan-tls-exported-authenticator-01

[Hannes Tschofenig <[e-mail]>]

I have read draft-sullivan-tls-exported-authenticator-01 and have a few
questions. I haven't followed this work previously but have been
wondering whether this functionality would be useful for "me".

The described functionality sounds like post-handshake authentication
from TLS 1.3 (although it does not use that term throughout the
document). I would have thought that this functionality is a replacement
to the TLS 1.2 renegotiation but then there is also the TLS 1.3 content
in there which raises the question about how this relates to the
post-handshake authentication functionality.

What does the following sentence mean and what is the use case for it?

"
  This proof of authentication can
   be exported and transmitted out of band from one party to be
   validated by the other party.
"

Who are the parties?

Ciao
Hannes