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Re: [TLS] Banning implicit CIDs in DTLS

Eric Rescorla <ekr@rtfm.com> Thu, 21 May 2020 16:21 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Thu, 21 May 2020 09:21:12 -0700
Message-ID: <CABcZeBNgwhKMYVo9gVqD3keAWnQx+LVKJjCO0nw6S0uCr=DfGQ@mail.gmail.com>
To: Christopher Wood <caw@heapingbits.net>
Cc: "TLS@ietf.org" <TLS@ietf.org>
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Subject: Re: [TLS] Banning implicit CIDs in DTLS
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This would be my preferred resolution

On Thu, May 21, 2020 at 8:59 AM Christopher Wood <caw@heapingbits.net>
wrote:

> PR #148 in the DTLS 1.3 draft (
> https://github.com/tlswg/dtls13-spec/pull/148) proposes banning implicit
> CIDs. This comes at an obvious cost in terms of bytes on the wire. However,
> in discussions on a parallel thread [1 and related], it's noted that this
> removes header malleability.
>
> Given that we don't have backing analysis suggesting that malleability
> (with the other AAD properties) is safe*, the chairs propose merging this
> PR as-is. To that end, please respond to the list by May 28, 2020,
> indicating whether or not you support this PR.
>
> Thanks,
> Chris, on behalf of the chairs
>
> *One proposal to address this is by extending the AAD to include the
> pseudo-header. However, the chairs feel this is an unnecessary divergence
> from QUIC.
>
> [1] https://mailarchive.ietf.org/arch/msg/tls/kFnlBW-TmlArcU0lD9UQdf_1t_o/
>
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