<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Am 02.12.2022 um 15:59 schrieb David Chadwick <<a href="mailto:d.w.chadwick@verifiablecredentials.info" class="">d.w.chadwick@verifiablecredentials.info</a>>:</div><br class="Apple-interchange-newline"><div class="">
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<div class="moz-cite-prefix">On 02/12/2022 13:48, Torsten
Lodderstedt wrote:<br class="">
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<div class="">Am 02.12.2022 um 12:46 schrieb David Chadwick
<<a href="mailto:d.w.chadwick@verifiablecredentials.info" class="moz-txt-link-freetext" moz-do-not-send="true">d.w.chadwick@verifiablecredentials.info</a>>:</div>
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<div class="moz-cite-prefix">On 02/12/2022 11:24, Torsten
Lodderstedt wrote:<br class="">
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Hi David,
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<div class="">Am 23.11.2022 um 19:14 schrieb David
Chadwick via Openid-specs-ab <<a href="mailto:openid-specs-ab@lists.openid.net" class="moz-txt-link-freetext" moz-do-not-send="true">openid-specs-ab@lists.openid.net</a>>:</div>
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<div class=""><p class="">Hi Torsten</p><p class="">excellent work. I fully support
its adoption by the WG</p>
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Thanks.<br class="">
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<div class=""><p class="">I note however that if the
Verifier uses a QR code to kick off the
transaction, then the wallet could equally
well display a QR code containing the
vp_token (assuming the VC is small enough)
in which case BLE will not be needed. This
flow should be supported.</p>
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<div class="">Do you mean the wallet would show a QR
code in response to the request encoded in the
verifier’s QR code?</div>
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</blockquote><p class="">Yes, the wallet can display a QR code in
answer to the verifier's request (in a QRcode). This
only works for small VP/VC due to the size restrictions
of QR codes, </p>
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<div class="">The QR code only contains a small amount of data sufficient
to establish a secure connection. The presentation request
itself is sent over BLE. Putting the whole request in the QR
Code would result in a much bigger QR Code. <br class="">
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</blockquote><p class="">So you are using the ISO mDL model where the initial message only
kicks off the BLE, then the request and response are sent via BLE.
I misunderstood. I thought the request was in the QRcode (as per
the cross device flow) and would have an additional parameter such
as UseBLE=True; - a bit like we do with Post=True for the
response)</p><p class="">If you use this model then you dont need a special message to
kick off the BLE do you?<br class="">
</p>
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<div class="">I would suggest to treat this is a another protocol besides
BLE. <br class="">
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</blockquote><p class="">Surely it would be better if the RP could display one QRcode with
it containing the choices that the wallet can take, instead of
multiple QR codes each for a different mode of interaction?</p><div class=""><br class=""></div></div></div></blockquote><br class="">This makes the protocol more complex than it is right now and the QR Code back and forth is not super use friendly. </div><div><br class=""></div><div>I would be reluctant to introduce additional complexity if we find out the BLE solution is quick and has a great UX.<br class=""><blockquote type="cite" class=""><div class=""><div class=""><p class="">Kind regards</p><p class="">David<br class="">
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<div class=""><p class="">but it will be a lot simpler than setting up a
BLE session (which I always find is tedious to do - e.g.
between my car and mobile phone).</p>
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You don’t need to setup a BLE session yourself with the QR Code
approach. That will happen automatically. UX is key! </div>
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<div class=""><p class="">Kind regards</p><p class="">David<br class="">
</p>
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<div class="">best regards.</div>
<div class="">Torsten. </div>
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<div class=""> <br class="webkit-block-placeholder">
</div><p class="">Kind regards</p><p class="">David<br class="">
</p>
<div class="moz-cite-prefix">On 23/11/2022
17:52, Torsten Lodderstedt via
Openid-specs-ab wrote:<br class="">
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<blockquote type="cite" cite="mid:025D3FE0-0599-48BA-8E02-A2B1259E09D4@lodderstedt.net" class="">
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Hi all,
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<div class="">Kristina, Kenichi, Sasi,
Ramesh, and myself have been working for a
couple of month on a specification to
enable VC presentation over BLE. </div>
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<div class="">Here is the link the
individual draft: <a href="https://tlodderstedt.github.io/openid-for-verifiable-presentations-offline-1_0-00.html" class="moz-txt-link-freetext" moz-do-not-send="true">https://tlodderstedt.github.io/openid-for-verifiable-presentations-offline-1_0-00.html</a></div>
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<div class="">We think this would be a
valuable extension to the OpenID 4 VCs
protocol family as it would allow offline
presentation (e.g. at the entrance of a
conference or a restaurant) using the
mechanisms we already have in OpenID4VPs.</div>
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</div>
<div class="">An implementation of the spec
is under way at MOSIP. </div>
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<div class="">We ask the WG to consider this
draft for adoption as WG document. </div>
<div class=""><br class="">
</div>
<div class="">best regards,</div>
<div class="">Torsten </div>
<br class="">
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