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<p class="MsoNormal">SIOP Special Topic Call Notes 23-Feb-23<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Mike Jones<o:p></o:p></p>
<p class="MsoNormal">Kristina Yasuda<o:p></o:p></p>
<p class="MsoNormal">Takahika Kawasaki<o:p></o:p></p>
<p class="MsoNormal">Torsten Lodderstedt<o:p></o:p></p>
<p class="MsoNormal">Brian Campbell<o:p></o:p></p>
<p class="MsoNormal">David Waite<o:p></o:p></p>
<p class="MsoNormal">Oliver Terbu<o:p></o:p></p>
<p class="MsoNormal">Joseph Heenan<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Agenda E-mail<o:p></o:p></p>
<p class="MsoNormal"> Kristina asked if pepole find having an agenda e-mail in advance useful<o:p></o:p></p>
<p class="MsoNormal"> Torsten said that it is<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Pull Requests<o:p></o:p></p>
<p class="MsoNormal"> <a href="https://bitbucket.org/openid/connect/pull-requests/">
https://bitbucket.org/openid/connect/pull-requests/</a><o:p></o:p></p>
<p class="MsoNormal"> PR #384: Add a cwt proof type<o:p></o:p></p>
<p class="MsoNormal"> Torsten updated the draft and asked Mike to to review it again<o:p></o:p></p>
<p class="MsoNormal"> Brian pointed out out that nonce is already registered in
<a href="https://www.iana.org/assignments/cwt/cwt.xhtml">https://www.iana.org/assignments/cwt/cwt.xhtml</a><o:p></o:p></p>
<p class="MsoNormal"> Oliver also pointed us to the registered x5chain header parameter at
<a href="https://www.iana.org/assignments/cose/cose.xhtml#header-parameters">https://www.iana.org/assignments/cose/cose.xhtml#header-parameters</a><o:p></o:p></p>
<p class="MsoNormal"> Torsten will look at these<o:p></o:p></p>
<p class="MsoNormal"> PR #463: removing the requirement around JSON-LD processing<o:p></o:p></p>
<p class="MsoNormal"> Torsten said that we need to wait for implementation feedback on whether JSON-LD processing is appropriate or not<o:p></o:p></p>
<p class="MsoNormal"> PR #461: Changed "types" claim to "type" to comply with VC data model<o:p></o:p></p>
<p class="MsoNormal"> There seemed to be support for this change<o:p></o:p></p>
<p class="MsoNormal"> PR #452: add proof_types_supported parameter for the Credential Issuer (Issue #1697)<o:p></o:p></p>
<p class="MsoNormal"> This is related to "cryptographic_binding_methods_supported"<o:p></o:p></p>
<p class="MsoNormal"> PR #431: Separate the missing and invalid proof cases<o:p></o:p></p>
<p class="MsoNormal"> Oliver asked whether there is a use case for making this distinction<o:p></o:p></p>
<p class="MsoNormal"> Torsten said that in either case, you would need to create a valid proof<o:p></o:p></p>
<p class="MsoNormal"> We discussed changing the name to invalid_proof but keeping there just being one error code<o:p></o:p></p>
<p class="MsoNormal"> PR #462: clarifying how request_uri can be used with OID4VP - Issue #1821<o:p></o:p></p>
<p class="MsoNormal"> This documents existing OAuth practices<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Security Analysis<o:p></o:p></p>
<p class="MsoNormal"> Torsten reported that Daniel Fett has been working on a security analysis of the full OpenID4VC suite<o:p></o:p></p>
<p class="MsoNormal"> He plans to create a PR submitting it to the WG next week<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Issues<o:p></o:p></p>
<p class="MsoNormal"> <a href="https://bitbucket.org/openid/connect/issues?status=new&status=open&component=SIOP&component=Verifiable%20Presentation&component=Credential%20Issuance">
https://bitbucket.org/openid/connect/issues?status=new&status=open&component=SIOP&component=Verifiable%20Presentation&component=Credential%20Issuance</a><o:p></o:p></p>
<p class="MsoNormal"> #1827: OpenID4VCI: The initial c_nonce is not issued by the credential issuer<o:p></o:p></p>
<p class="MsoNormal"> Torsten pushed back on Brian's suggestion to remove c_nonce<o:p></o:p></p>
<p class="MsoNormal"> Brian didn't find the complexity worth it<o:p></o:p></p>
<p class="MsoNormal"> An initial request needn't include a c_nonce<o:p></o:p></p>
<p class="MsoNormal"> It's a decision of the AS whether to support providing an initial nonce in the request<o:p></o:p></p>
<p class="MsoNormal"> Torsten would like to observe what developers are implementing<o:p></o:p></p>
<p class="MsoNormal"> Taka suggested more discussion and possibly a table listing the available options<o:p></o:p></p>
<p class="MsoNormal"> Torsten said that c_nonce is already listed as being OPTIONAL<o:p></o:p></p>
<p class="MsoNormal"> Kristina will create a clarification PR<o:p></o:p></p>
<p class="MsoNormal"> #1828: OpenID4VCI: simplification of deferred issuance<o:p></o:p></p>
<p class="MsoNormal"> Torsten pointed out that if we were to return an error, the requester wouldn't know when to retry<o:p></o:p></p>
<p class="MsoNormal"> He said that the acceptance token is essentially a transaction identifier<o:p></o:p></p>
<p class="MsoNormal"> He said that CIBA similarly has a transaction ID<o:p></o:p></p>
<p class="MsoNormal"> Torsten said that issuance may result in expensive offline back-office actions<o:p></o:p></p>
<p class="MsoNormal"> You don't want to repeat those actions upon retrying<o:p></o:p></p>
<p class="MsoNormal"> Oliver's mental model is that you'd create a second request with the full parameter set<o:p></o:p></p>
<p class="MsoNormal"> Torsten said that authorization pending is different than issuance pending<o:p></o:p></p>
<p class="MsoNormal"> Taka was convinced by Torsten's description of the need to identify the pending issuance transaction<o:p></o:p></p>
<p class="MsoNormal"> #1667: Tracking Implementations of VCI spec<o:p></o:p></p>
<p class="MsoNormal"> Nat had opened this issue to track implementations<o:p></o:p></p>
<p class="MsoNormal"> Taka had been asking about known implementations<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Next Call<o:p></o:p></p>
<p class="MsoNormal"> The next call will be Monday, February 27th at 3pm Pacific Time<o:p></o:p></p>
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