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<p class="MsoNormal">SIOP Special Topic Call Notes 11-Aug-22<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kristina Yasuda<o:p></o:p></p>
<p class="MsoNormal">Mike Jones<o:p></o:p></p>
<p class="MsoNormal">Joseph Heenan<o:p></o:p></p>
<p class="MsoNormal">Giuseppe De Marco<o:p></o:p></p>
<p class="MsoNormal">David Chadwick<o:p></o:p></p>
<p class="MsoNormal">Brian Campbell<o:p></o:p></p>
<p class="MsoNormal">John Bradley<o:p></o:p></p>
<p class="MsoNormal">Geroge Fletcher<o:p></o:p></p>
<p class="MsoNormal">David Waite (DW)<o:p></o:p></p>
<p class="MsoNormal">Jeremie Miller<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 #265: static configuration data in openid4vp and siopv2<o:p></o:p></p>
<p class="MsoNormal"> Kristina said that this needs to be reworked to incorporate feedback<o:p></o:p></p>
<p class="MsoNormal"> David Chadwick said that this would be the minimum MTI subset<o:p></o:p></p>
<p class="MsoNormal"> Kristina said that it's not MTI at present<o:p></o:p></p>
<p class="MsoNormal"> David Chadwick said that this would the default<o:p></o:p></p>
<p class="MsoNormal"> Mike told people about the MTI requirements in the Connect Core spec<o:p></o:p></p>
<p class="MsoNormal"> <a href="https://openid.net/specs/openid-connect-core-1_0.html#ImplementationConsiderations">
https://openid.net/specs/openid-connect-core-1_0.html#ImplementationConsiderations</a><o:p></o:p></p>
<p class="MsoNormal"> George said that we should either define a minimum or define nothing at all<o:p></o:p></p>
<p class="MsoNormal"> Kristina said that defining MTI functionality could cause push-back in the marketplace<o:p></o:p></p>
<p class="MsoNormal"> George said that if it's not MTI, maybe we should leave it out for now<o:p></o:p></p>
<p class="MsoNormal"> Mike suggested that we could add this as a non-normative example in an appendix<o:p></o:p></p>
<p class="MsoNormal"> David Chadwick said that he wanted this to parallel the same kind of functionality in the SIOP spec<o:p></o:p></p>
<p class="MsoNormal"> Kristina is supportive of putting this functionality in an appendix<o:p></o:p></p>
<p class="MsoNormal"> David Chadwick said that we should do the same for SIOP<o:p></o:p></p>
<p class="MsoNormal"> This is related to issue #1573: Static metadata for the authz server<o:p></o:p></p>
<p class="MsoNormal"> PR #261: added implementation considerations on credential refresh<o:p></o:p></p>
<p class="MsoNormal"> This was updated by Jeremie<o:p></o:p></p>
<p class="MsoNormal"> Additional reviews are requested<o:p></o:p></p>
<p class="MsoNormal"> We discussed terminology: refresh versus update<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">
https://bitbucket.org/openid/connect/issues?status=new&status=open</a><o:p></o:p></p>
<p class="MsoNormal"> #1590: `vp_formats_supported` server metadata in OpenID4VP underspecified<o:p></o:p></p>
<p class="MsoNormal"> Kristina asked whether people agree with the proposed syntax<o:p></o:p></p>
<p class="MsoNormal"> David Chadwick was in support<o:p></o:p></p>
<p class="MsoNormal"> DW said that he doubts that people actually want this number of choices<o:p></o:p></p>
<p class="MsoNormal"> Kristina said that the algorithms for different formats might very well be different<o:p></o:p></p>
<p class="MsoNormal"> Mike said that syntactically, we tend to use metadata names like "id_token_signing_alg_values_supported" rather than "alg"<o:p></o:p></p>
<p class="MsoNormal"> This is from <a href="https://openid.net/specs/openid-connect-discovery-1_0.html">
https://openid.net/specs/openid-connect-discovery-1_0.html</a><o:p></o:p></p>
<p class="MsoNormal"> #1577: Cryptographic proof of possession nonce management<o:p></o:p></p>
<p class="MsoNormal"> Kristina said that the proof is very similar to a DPoP proof<o:p></o:p></p>
<p class="MsoNormal"> She asked if we should mandate including "jti" like DPoP does<o:p></o:p></p>
<p class="MsoNormal"> George said that the nonce gives you freshness<o:p></o:p></p>
<p class="MsoNormal"> Whereas the access token hash proves that it was bound to a particular token<o:p></o:p></p>
<p class="MsoNormal"> We discussed similarities to DPoP<o:p></o:p></p>
<p class="MsoNormal"> We discussed threat models, including proof pre-generation<o:p></o:p></p>
<p class="MsoNormal"> In this case, person who is the legitimate user of a legitimate client is the attacker<o:p></o:p></p>
<p class="MsoNormal"> Brian said that the "iat" format in the PR is wrong and to remove "typ":"JWT"<o:p></o:p></p>
<p class="MsoNormal"> Mike suggested that perhaps people with DPoP expertise compare DPoP to this feature<o:p></o:p></p>
<p class="MsoNormal"> to understand what's parallel and what's different<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, August 14, 2022 at 4pm Pacific Time<o:p></o:p></p>
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