Subject: Re: [TLS] External PSK design team

From: "Owen Friel (ofriel)" <[email-masked]>
Date: Mon, 3 Feb 2020 22:07:18 +0000

I’m also interested in helping here for potential applicability for IoT device onboarding.

From: TLS <[email-masked]> On Behalf Of Eric Rescorla
Sent: 21 January 2020 14:52
To: Jonathan Hoyland <[email-masked]>
Cc: Björn Haase <[email-masked]>; TLS List <[email-masked]>; Mohit Sethi M <mohit.m.sethi=[email-masked]>
Subject: Re: [TLS] External PSK design team

I am willing to contribute.

-Ekr

On Tue, Jan 21, 2020 at 2:50 AM Jonathan Hoyland <[email-masked]<mailto:[email-masked]>> wrote:
Hi All,

This is something I'm very interested in.

Definitely want to participate.

Regards,

Jonathan

On Tue, 21 Jan 2020 at 10:04, Mohit Sethi M <mohit.m.sethi=[email-masked]<mailto:[email-masked]>> wrote:
I would let CFRG deal with the PAKE selection process:
https://mailarchive.ietf.org/arch/msg/cfrg/-a1sW3jK_5avmb98zmFbCNLmpAs
and not have this design team spend time and energy on designing PAKEs.

--Mohit

On 1/21/20 11:52 AM, Björn Haase wrote:
> Hello to all,
>
> I am also willing to contribute. My concern is that I observe that in some industrial control applications, PSK mechanisms (that actually require high-entropy keys) are (mis)-used in conjunction with TLS, where the PSK is actually of insufficient entropy (maybe derived only from a 4 digit PIN).
>
> In order to fix this issue, I'd really appreciate to have an PSK-style TLS operation using a balanced PAKE (note that this could be implemented with virtually no computational overhead in comparison to conventional ECDH session key generation).
>
> Yours,
>
> Björn.
>
>
>
> Mit freundlichen Grüßen I Best Regards
>
> Dr. Björn Haase
>
>
> Senior Expert Electronics | TGREH Electronics Hardware
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> -----Ursprüngliche Nachricht-----
> Von: TLS <[email-masked]<mailto:[email-masked]>> Im Auftrag von Mohit Sethi M
> Gesendet: Dienstag, 21. Januar 2020 10:45
> An: Colm MacCárthaigh <[email-masked]<mailto:[email-masked]>>; Sean Turner <[email-masked]<mailto:[email-masked]>>
> Cc: TLS List <[email-masked]<mailto:[email-masked]>>
> Betreff: Re: [TLS] External PSK design team
>
> I am certainly interested and willing to contribute. We need some
> consensus on whether PSKs can be shared with more than 2 parties,
> whether the parties can switch roles, etc.
>
> EMU is going to work on EAP-TLS-PSK and the question of
> privacy/identities will pop-up there too.
>
> --Mohit
>
> On 1/21/20 7:33 AM, Colm MacCárthaigh wrote:
>> Interested, as it happens - this is something I've been working on at Amazon.
>>
>> On Mon, Jan 20, 2020 at 8:01 PM Sean Turner <[email-masked]<mailto:[email-masked]>> wrote:
>>> At IETF 106, we discussed forming a design team to focus on external PSK management and usage for TLS. The goal of this team would be to produce a document that discusses considerations for using external PSKs, privacy concerns (and possible mitigations) for stable identities, and more developed mitigations for deployment problems such as Selfie. If you have an interest in participating on this design team, please reply to this message and state so by 2359 UTC 31 January 2020.
>>>
>>> Cheers,
>>>
>>> Joe and Sean
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