[CFRG] Fwd: MIMI WG requests CFRG review of MIMI franking mechanism

[Rohan Mahy <[e-mail]>]

Hello All,
I am writing a third time to request review by the CFRG community of the
MIMI franking mechanism. This is documented in
draft-ietf-mimi-protocol in Section
5.4.1
<https://www.ietf.org/archive/id/draft-ietf-mimi-protocol-03.html#name-message-franking>
.
I requested a few minutes of agenda time on this topic in Bangkok.

Thank,
-rohan

---------- Forwarded message ---------
From: Rohan Mahy <[e-mail]>
Date: Tue, Jan 21, 2025 at 11:25 PM
Subject: Re: MIMI WG requests CFRG review of MIMI franking mechanism
To: CFRG <[e-mail]>
Cc: mimi <[e-mail]>


Hi,
This is a reminder of the request from the MIMI working group for review of
its current franking mechanism.
Thanks,
-rohan

On Mon, Dec 23, 2024 at 9:01 PM Rohan Mahy <[e-mail]> wrote:

> Hello,
>
> The MIMI WG is about interoperability among federated Instant Messaging
> providers whose clients use MLS for end-to-end security. MIMI is producing
> a mimi-protocol document which contains a mechanism to "frank" MIMI content
> messages received by the "Hub", so that a receiver can later allege abuse
> and the Hub can verify if it indeed saw the same message.
>
> As mentioned in mimi-protocol the mechanism is very similar to the
> Facebook franking scheme, but as a federated architecture there are
> "follower" providers which should not see the sender of a message and might
> maliciously try to modify the data added by the Hub (its timestamp and
> frank).
>
> On behalf of the MIMI WG, I would like to request a formal review by CFRG
> of the franking mechanism as detailed in mimi-protocol (below). The
> relevant documents are:
>
> MIMI Protocol (link points to the start of the franking section)
>
> https://ietf-wg-mimi.github.io/mimi-protocol/draft-ietf-mimi-protocol.html#name-message-franking
>
> MIMI Architecture (If you want to get the big picture)
> https://www.ietf.org/archive/id/draft-ietf-mimi-arch-01.html
>
> MIMI Content - includes a per-message salt used in the franking
> construction.
> https://www.ietf.org/archive/id/draft-ietf-mimi-content-05.html
>
> Many thanks and happy holidays,
> -rohan
>
>
>
>