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Re: [jose] JWP

Torsten Lodderstedt <torsten@lodderstedt.net> Thu, 28 July 2022 07:30 UTC

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From: Torsten Lodderstedt <torsten@lodderstedt.net>
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Date: Thu, 28 Jul 2022 09:30:37 +0200
In-Reply-To: <A6F210BB-1F6F-4235-A213-2E274561D5F6@forgerock.com>
Cc: Tobias Looker <tplooker@gmail.com>, jose@ietf.org
To: Neil Madden <neil.madden@forgerock.com>
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Subject: Re: [jose] JWP
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> Am 28.07.2022 um 08:57 schrieb Neil Madden <neil.madden@forgerock.com>:
> 
> {
> “iss”: “gov.uk <http://gov.uk/>”,
> “over_18”: true
> }
> 
> If this is signed using a deterministic signature algorithm (eg EdDSA) then the token will be identical for everyone that is over 18 and so naturally unlinkable. 

Such a credential needs to be bound to the legit holder, which is typically achieved by adding a public key (reference) to it (which is missing in your example). The holder must then create a presentation signed with the corresponding private key to proof possession and with that legitimate holdership. That key results in likability.

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