Paul Hoffman <[email protected]> wrote:
>
> During earlier discussions of opportunistic encryption in the IETF,
> attempted-but-not-required authentication was strongly preferred over
> "don't even attempt to authenticate".

This is only worthwhile if there is downgrade protection, i.e. the client
needs to be able to tell if it is supposed to be able to rely on an
authentication mechanism (e.g. using DANE). Without downgrade protection
it's equivalent to encryption without authentication.

We discussed this a few weeks ago, thread starting at
https://www.ietf.org/mail-archive/web/dns-privacy/current/msg02124.html

Tony.
-- 
f.anthony.n.finch  <[email protected]>  http://dotat.at/
North Fitzroy, Sole: Variable 4, becoming easterly 4 or 5 in east Sole.
Moderate, occasionally rough at first. Fair. Good.

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