Re: [MLS] 20200908 MLS WG Virtual Interim

Richard Barnes <rlb@ipv.sx> Tue, 08 September 2020 17:56 UTC

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From: Richard Barnes <rlb@ipv.sx>
Date: Tue, 8 Sep 2020 13:56:40 -0400
Message-ID: <CAL02cgRUFwzOsSp397n9OGgwY5keK1+nR2NUupifRfpq7iTq2Q@mail.gmail.com>
To: Sean Turner <sean@sn3rd.com>
Cc: MLS List <mls@ietf.org>
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Subject: Re: [MLS] 20200908 MLS WG Virtual Interim
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Here are my notes:

2020-09-08
* #336
    * ReInit as Proposal makes sense, just require that it be the last
proposal in the Commit
    * Also have Replace with Welcome / H(Welcome)?
* #337 - Hold pending #336
* #360 - RLB and Brendan working out details, will merge when ready
* #349
    * Anonymous version could make ordering requirements difficult for
server / require more state
    * Anonymous version could complicate fork detection; since messages in
the two forks will have different epochIDs, they won’t be obviously
colliding
    * Whichever we do (current or anonymous), the other one can be built
over the top:
        * Anonymous->not: Leak extra information, e.g., in AAD
        * Not->Anonymous: Strip/replace groupID+epoch in MLSCiphertext on
send, reconstitute on receive
    * For now: Keep anonymous thing, make bigger, add operational
considerations (server vis, fork detection => leak in AAD)


On Tue, Sep 8, 2020 at 9:36 AM Sean Turner <sean@sn3rd.com> wrote:

> Hi! We are having a virtual interim Tuesday 9 September 2020 at 1600 UTC.
> Webex details can be found here:
> https://datatracker.ietf.org/meeting/interim-2020-mls-20/session/mls
> Our agenda is to address protocol related issues and PRs. Outstanding
> Issues and PRs can be found here:
> https://github.com/mlswg/mls-protocol
>
> Nick and Sean
> _______________________________________________
> MLS mailing list
> MLS@ietf.org
> https://www.ietf.org/mailman/listinfo/mls
>