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Re: Verifiable Driver's Licenses and ISO-18013-5 (mDL)

From: Adrian Gropper <agropper@healthurl.com>
Date: Tue, 7 Dec 2021 14:00:14 -0600
Message-ID: <CANYRo8hjz=+kzvBP3EGw61=_zHTdcA_w6tjC0wVMGgDiGeHDug@mail.gmail.com>
To: Andrew Hughes <andrewhughes3000@gmail.com>
Cc: David Chadwick <d.w.chadwick@verifiablecredentials.info>, "W3C Credentials CG (Public List)" <public-credentials@w3.org>
The issue, from my privacy perspective, is selective release through
attenuated capabilities in a way that supports delegation. Otherwise, the
linkage of possession to consent breaks separation of concerns and does not
scale in terms of service costs and adoption.

On the other hand, an approach based on delegation and capabilities gives
the subject control over whether to delegate to themselves or to an agent
and this is as fundamental as the Law of Agency.
https://datatracker.ietf.org/wg/gnap/about/ is really the only game in town.

- Adrian

On Tue, Dec 7, 2021 at 12:47 PM Andrew Hughes <andrewhughes3000@gmail.com>

> Sure - but that's not really my question even if it's the requirement that
> caused the creation of the MSO mechanism.
> I'm trying to guide the ISO WG (with others too) on
> good/compatible/interoperable ways to do 'over the internet' data
> transmission for 18013-5 mDL apps. Today in 18013-5 the requirement is to
> use the MSO for verification. This does indeed allow the mDL app to
> selectively *release* those data elements it or the person chooses to
> release - it's a simple 'send or don't send' selective release mechanism -
> but it works very well for the main use cases.
> Tomorrow's mDL data integrity mechanism? We can negotiate :-)
> PS We could bikeshed on whether selective release of data is the same or
> different from selective disclosure of data...(but please no)
> ————————
> *Andrew Hughes *CISM CISSP
> m +1 250.888.9474
> AndrewHughes3000@gmail.com
> On Tue, Dec 7, 2021 at 10:23 AM David Chadwick <
> d.w.chadwick@verifiablecredentials.info> wrote:
>> On 07/12/2021 18:07, Andrew Hughes wrote:
>> Hi Manu et al - thanks for this work.
>> I'm working through the material and comparing to the ISO WG 18013-5 work.
>> I can see very good coverage of the core mDL data model (the list of data
>> elements in ISO 18013-5) in this work.
>> The part that appears to be not covered here is the protocol-related
>> clauses and the data integrity and "mdoc authentication" using the Mobile
>> Security Object (MSO). While the MSO is technically not inside the data
>> model in 18013-5 it is required in order for the verifier to confirm data
>> integrity per-data-element.
>> In 18013-5 there is a procedure in the Security Mechanisms clause that
>> describes the steps a Verifier must perform in order to confirm data
>> integrity and issuer of each data element. This is for 'server retrieval'
>> mode and uses JWT/JWS for data integrity.
>> The key issue as I see it, is how to support selective disclosure. There
>> are many alternative methods that are possible, each having their pros and
>> cons. There is no one best solution that everyone agrees on at the moment.
>> So perhaps one approach to address this problem is to draw up a table of
>> all the possible alternative solutions and to list their pros and cons in
>> an objective manner. Then implementors/regulators/funders etc can choose
>> the best method that fits their particular application use case.
>> Kind regards
>> David
>> I realize that the VC approach in this work is not the same - but how
>> should we accommodate issuers who want or need to use the 18013-5 MSO
>> security approach?
>> Verifiers following the 18013-5 verification approach will be expecting
>> to get an MSO for processing.
>> This is the biggest item that I continue to struggle to conceptualize
>> (even before this work was circulated) - whether the MSO approach is
>> fundamental to the concept of Mobile Driving License, or if that's just one
>> approach to data integrity etc. And whether any other equivalent proof
>> mechanism is acceptable for conformity to 18013-5 (which is what Issuers
>> are likely to demand of any vendor/app)
>> andrew.
>> ————————
>> *Andrew Hughes *CISM CISSP
>> m +1 250.888.9474
>> AndrewHughes3000@gmail.com
Received on Tuesday, 7 December 2021 20:00:41 UTC

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