(speaking not as UTA chair)

Hi Toerless,

if we are talking about IOT devices, then I've been told a lot of times by
more knowledgeable than I 
people that IOT devices mostly rely on DTLS and not on TLS. And DTLS is
explicitly 
mentioned in the draft as being out of scope. 

Regards,
Valery.


> Dear IESG, *:
> 
> We received IESG review for draft-ietf-anima-brski-prm that was asking to
make
> the use of TLS 1.3 mandatory based on the expectation that
draft-ietf-uta-require-
> tls13 would become RFC - unless we provide sufficient justification in our
(prm)
> draft.
> 
> I would like to point out, that it is the current version of
draft-ietf-uta-require-tls13
> whose core applicability reasoning is misleading:
> 
> "since TLS 1.3 use is widespread, ...
>    new protocols that use TLS must require and assume its existence
> 
> This is not correct. Correct would be is:
> 
> "since TLS 1.3 use is widespread in browser, ...
>    new protocols that use browsers and TLS must require its use and assume
its
> existence,
>    protocols not using browsers must recommend its use and assume its
existance
> 
> Recommending, but not requiring the use of TLS 1.3 is unfortunately
necessary for
> quite a while for the much larger space of IOT equipment and protocols
written for
> non-browser enviroments where IOT equipment is important to be supported.
> Such IOT equipment often comes with SDK that can not be upgraded for long
> periods of time, sometimes as long as 10 years or longer, and/or solutions
where
> upgrade of SDK (including OS) would require very expensive
re-certification such
> as FIPS 140 or required regulatory requirements.
> 
> If you think this is not appropriate, then please stop flying planes,
because planes
> are one example of systems in which basic systems are not possible to
rewrite
> from scratch because they can not for various, including financial reasons
be re-
> qualified at such a base level.
> 
> I hope other readers of this email worrying about being able to apply IETF
protocol
> standards to IOT environment can chime in on this concerns.
> 
> Short of that, the above text is suggested re-write of the core
applicability point of
> the UTA draft. There may be other text to update.
> 
> Cheers
>     Toerless

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