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[OAUTH-WG] Re: SD-JWT and Unlinkability

Daniel Fett <mail@danielfett.de> Tue, 24 September 2024 11:07 UTC

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From: Daniel Fett <mail@danielfett.de>
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Subject: [OAUTH-WG] Re: SD-JWT and Unlinkability
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A few points:

* Batch credential issuing is completely transparent to the user.

* The selection is done by the Wallet, before presentation.

* It doesn't need to be random, the Wallet can just select the next 
credential.

-Daniel

Am 21.09.24 um 17:53 schrieb Tom Jones:
> that doesn't answer the question about users randomly selecting some 
> to store and some to reject.  This seems to me like user private 
> information.
> As is most of the feedback to the issuer from the wallet.
> Peace ..tom jones
>
>
> On Sat, Sep 21, 2024 at 7:30 AM Daniel Fett 
> <mail=40danielfett.de@dmarc.ietf.org> wrote:
>
>     Hi Dick,
>
>     Batch credential (not claims) issuing has become the default
>     approach to circumvent the inherent limitations of
>     salted-hash-based credentials formats. This was neither invented
>     by us, nor is it unreasonable to ask implementers to do it.
>     Protocols such as OpenID4VCI support it.
>
>     -Daniel
>
>     Am 21.09.24 um 06:42 schrieb Dick Hardt:
>>     Is it really going to be practical to batch issue claims, and
>>     have the holder randomly choose between them on presentation?
>>
>>     As an implementer, what is the right number of claims to be in a
>>     batch?
>>
>>     This section of the draft reads as a hack to add a new capability
>>     (unlinkability) to a mechanism that did not have that as a design
>>     objective.
>>
>>     This is going to be like the "alg":"null" for SD-JWT. :-)
>>
>>
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