Re: [EAT] Scope, Goals & Background for RATS

Carsten Bormann <cabo@tzi.org> Tue, 18 September 2018 17:49 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Tue, 18 Sep 2018 19:49:24 +0200
Cc: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, eat@ietf.org, rats@ietf.org
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To: Denis <denis.ietf@free.fr>
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Subject: Re: [EAT] Scope, Goals & Background for RATS
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On 18. Sep 2018, at 17:56, Denis <denis.ietf@free.fr> wrote:
> 
> I fear that we don't understand each other. 

I think this is the usual terminology problem about “identity”.

Identity is a set of claims.

In the example, the device can prove possession of a key.

The manufacturer provides a signed claim (“certificate”) that possession of that key implies a certain set of protection properties.

That claim (together with the proven possession of the key) becomes the identity of the device that Henk was talking about.  The X.509 certificate that carries the manufacturer’s claim can therefore be called an “identity document”.

It is an identity that thousands of devices share (just as I share the identity that allows me to buy cigarettes from a vending machine in Germany, i.e. I’m 18 or older).  Note that identity can be limited and directed (which makes it somewhat different from identification).

Grüße, Carsten