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Re: [Rats] Function of an endorsement relative to evidence

Henk Birkholz <henk.birkholz@sit.fraunhofer.de> Mon, 06 June 2022 16:44 UTC

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Message-ID: <ee639c74-b365-e127-b4ec-d6f9df0014e6@sit.fraunhofer.de>
Date: Mon, 06 Jun 2022 18:44:11 +0200
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To: Laurence Lundblade <lgl@island-resort.com>, rats <rats@ietf.org>
References: <6F919543-37BA-484B-AA7E-BAC3497EB125@island-resort.com>
From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/JAhJyA_J8pZvz6fT_G9XjnQZPzo>
Subject: Re: [Rats] Function of an endorsement relative to evidence
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Hi Laurence,

On 04.06.22 23:16, Laurence Lundblade wrote:
> The fundamental purpose of an Endorsement is to tell the Verifier that they can believe what they get in Evidence. There may be some varying degree here from claim to claim and device to device, but the basic  principle always holds.

Well, actually I'd say that is a subset of what Endorsements are about. 
The few components in a Attester that you cannot produce Evidence about 
need Endorsements instead.

If an Attester does not know that is painted green, then that is a Claim 
about the Attester that has to come from the outside, has to be endorsed 
trusted third party (and here we go traditional... manufacturer, owner, 
etc.), because the Attester would never know that (only in weird cases, 
that is not the point) on its own devices.

On 05.06.22 21:34, Michael Richardson wrote:
> So, it is*NEVER*  useful as Evidence.  EVER.

As the Attester can at the very best "cache" or "carry" an Endorsement 
put there during manufacturing, I think I have to agree with Michael 
here. Please note, in order to be useful and believable, the Endorsement 
is not signed by the Attester, but the Endorser! With key material not 
available to the Attester.

Viele Grüße,

Henk

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