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Re: [Teep] JSON/JOSE vs. CBOR/COSE

Mingliang Pei <mingliang.pei@broadcom.com> Thu, 20 February 2020 17:22 UTC

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From: Mingliang Pei <mingliang.pei@broadcom.com>
Date: Thu, 20 Feb 2020 09:22:01 -0800
Message-ID: <CABDGos7T5rjN4qHUyg_ptC+uB4gEjY26pe3=Z+Kky-LG5gkHDQ@mail.gmail.com>
To: Nicolae Paladi <nicolae.paladi@ri.se>
Cc: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "teep@ietf.org" <teep@ietf.org>
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Subject: Re: [Teep] JSON/JOSE vs. CBOR/COSE
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I agree we move forward TEEP protocol with one mandatory format: CBOR /
COSE, and focus on specifying only one for now. Thanks, Ming

On Thu, Feb 20, 2020 at 6:26 AM Nicolae Paladi <nicolae.paladi@ri.se> wrote:

>
>
> On 20 Feb 2020, at 11:16, Hannes Tschofenig <Hannes.Tschofenig@arm.com>
> wrote:
>
> Hi all,
>
> With the impression from the Hackathon in mind I am wondering whether we
> should make a decision about the encoding of the TEEP protocol messages.
> Today, the spec allows two types of encodings, namely JSON and CBOR (with
> their security mechanisms).
>
> It is obviously a pain to implement both encodings. The spec supports two
> encodings because the OTrP design was based on JSON / JOSE and it felt
> logical to “inherit” this encoding. Then, we added CBOR and COSE for use
> with constrained devices.
>
> I believe we should only have one encoding.
>
> CBOR and COSE appear to be the better choice (although I have been working
> on an implementation of JSON and JOSE at the Hackathon). While JSON/JOSE is
> easier to debug the TEEP protocol is actually quite simple. The use of
> CBOR/COSE will allow us to keep the trusted computing base smaller
> considering that SUIT manifests as well as EAT tokens are/can be encoded in
> CBOR and protected by COSE.
>
>
> I agree, better to focus on one format.
>
> Best regards,
> Nicolae
>
>
> With this email I wanted to kick-off a discussion. What do you think?
>
> Ciao
> Hannes
>
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