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Add comments on key discovery #111

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Jul 5, 2023
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Add comments on key discovery #111

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Add comments on key discovery
OR13 Jun 26, 2023
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91 changes: 87 additions & 4 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -126,7 +126,7 @@ <h5>Verifiable Credentials Data Model</h5>
<h2>Securing JSON</h2>
<p>
This section
provides guidance on how to use JSON [[RFC7159]] claimsets with JWT registered claims to construct
provides guidance on how to use JSON [[RFC7159]] claimsets with JWT <a href="#registered-claim-names">registered claims</a> to construct
a JWT that can be mapped to a verifiable credential. This section also describes
how to use content types and token types to distinguish different representations of verifiable credentials.
</p>
Expand Down Expand Up @@ -321,6 +321,88 @@ <h2>Securing JSON-LD VCs with COSE</h2>
</section>
</section>



<section class="normative">
<h2>Key Discovery</h2>
<p>
In order to complete the <a data-cite="VC-DATA-MODEL#dfn-verify">verification</a> process,
a <a data-cite="VC-DATA-MODEL#dfn-verifier">verifier</a> needs to obtain the cryptographic keys used to secure the
<a data-cite="VC-DATA-MODEL#dfn-credential">credential</a>.
</p>
<p>
There are several different ways to discover the verification keys of
the <a data-cite="VC-DATA-MODEL#dfn-issuers">issuers</a>
and <a data-cite="VC-DATA-MODEL#dfn-holders">holders</a>.
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</p>

<section>
<h2>Registered Claim Names</h2>
<p>
When found in the <a data-cite="RFC7515#section-4.1">Protected Header</a>, or
the <a data-cite="RFC7519#section-4.1.1">Protected Claimset</a>, members present in
<a href="https://www.iana.org/assignments/jwt/jwt.xhtml">IANA Assignments for JSON Web Token (JWT)</a> and
<a href="https://www.iana.org/assignments/jose/jose.xhtml">IANA Assignments for JSON Object Signing and Encryption (JOSE)</a>
are to be interpreted according to the associated specifications referenced by IANA.
</p>
<p>
<a href="#registered-claim-names">Registered claims</a> that are present in either
the <a data-cite="RFC7515#section-4.1">Protected Header</a>
or the <a data-cite="RFC7519#section-4.1.1">Claimset</a> can be used to help
<a data-cite="VC-DATA-MODEL#dfn-verifier">verifiers</a> discover verification keys.
</p>
<section>
<h2>kid</h2>
<p>
If <code>kid</code> is present in the <a data-cite="RFC7515#section-4.1">Protected Header</a>,
a <a data-cite="VC-DATA-MODEL#dfn-verifier">verifier</a> can use this parameter
to obtain a <a data-cite="RFC7517#section-4">JSON Web Key</a> to use in the
<a data-cite="VC-DATA-MODEL#dfn-verify">verification</a> process.
</p>
</section>
<section>
<h2>iss</h2>
<p>
If <code>iss</code> is present in the <a data-cite="RFC7515#section-4.1">Protected Header</a>
or the <a data-cite="RFC7519#section-4.1.1">JWT Claims </a>,
a <a data-cite="VC-DATA-MODEL#dfn-verifier">verifier</a> can use this parameter
to obtain a <a data-cite="RFC7517#section-4">JSON Web Key</a> to use in the
<a data-cite="VC-DATA-MODEL#dfn-verify">verification</a> process.
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</p>
<p>
If <code>kid</code> is also present, it is expected to be useful to distinguish the specific key used.
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Does this mean kid could be in the payload? It's defined as a header parameter:

https://datatracker.ietf.org/doc/html/rfc7515#section-4.1.4

Or is this just referring to kid appearing in the header and iss in the payload? How should "also present" be interpreted here?

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Also, how is kid to be useful to distinguish the specific key used? This cries out for an example, or a fair amount of additional prose.

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AFAIK, kid is legal in payload, in the same way that baz or alg is legal in payload.

The sentence is not attempting to be specific about where kid can be found, but kid does have special meaning when its in the protected header.

can you make a concrete change suggestion?

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Yes, I've made a suggestion to clarify that we're talking about kid being present in the protected header.

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</p>
</section>
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<section>
<h2>cnf</h2>
<p>
If <code>cnf</code> is present in the <a data-cite="RFC7515#section-4.1">Protected Header</a>
or the <a data-cite="RFC7519#section-4.1.1">JWT Claims </a>,
a <a data-cite="VC-DATA-MODEL#dfn-verifier">verifier</a> can use this parameter
to obtain a <a data-cite="RFC7517#section-4">JSON Web Key</a> to use in the
<a data-cite="VC-DATA-MODEL#dfn-verify">verification</a> process.
</p>
<p>
If <code>kid</code> is also present, it is expected to be useful to distinguish the specific key used.
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</p>
</section>
</section>

<section>
<h2>Well Known URIs</h2>
<p class="issue">
The working group is currently exploring how
<a data-cite="RFC5785#section-3">Defining Well-Known Uniform Resource Identifiers (URIs)</a>
could be leveraged to assist a <a data-cite="VC-DATA-MODEL#dfn-verifier">verifier</a> in discovering verification keys for
<a data-cite="VC-DATA-MODEL#dfn-issuers">issuers</a>
and <a data-cite="VC-DATA-MODEL#dfn-holders">holders</a>.
</p>
</section>


</section>

<section id="conformance">
<section class="normative">
<h2>JSON Web Token Header Parameters</h2>
Expand All @@ -347,7 +429,7 @@ <h2>JSON Web Token Header Parameters</h2>
This includes but is not limited to: <code>iss</code>, <code>kid</code>, <code>alg</code>, <code>iat</code>, <code>exp</code> and <code>cnf</code>.
</p>
<p>
The registered claim names <code>vc</code> and <code>vp</code> MUST NOT be present as header parameters.
The <a href="#registered-claim-names">registered claim</a> names <code>vc</code> and <code>vp</code> MUST NOT be present as header parameters.
</p>
<p>
When present, members of the header are to be interpreted and processed according to
Expand All @@ -360,7 +442,7 @@ <h2>JSON Web Token Header Parameters</h2>
</section>
<section class="normative">
<h2>Securing Verifiable Credentials</h2>
<p>The [[VC-DATA-MODEL]] describes the approach taken by JSON Web Tokens to securing claimsets as applying an <code>external proof</code>.</p>
<p>The <a data-cite="VC-DATA-MODEL#proof-formats"></a> describes the approach taken by JSON Web Tokens to secure claimsets as <i>applying an <code>external proof</code></i>.</p>
<p>The normative statements in <a data-cite="VC-DATA-MODEL#securing-verifiable-credentials">Securing Verifiable Credentials</a> apply to
securing <code>application/vc+ld+json</code> and <code>application/vp+ld+json</code>
as <code>application/vc+ld+jwt</code> and <code>application/vp+ld+jwt</code>.
Expand Down Expand Up @@ -419,6 +501,7 @@ <h2>Securing Verifiable Credentials</h2>
</p>
<p>Issuers, Holders and Verifiers MUST ignore all claimsets that have no integrity protection.</p>
</section>

</section>

<section class="normative">
Expand Down Expand Up @@ -951,7 +1034,7 @@ <h3>Example Mapping</h3>
<ul>
<li>
Extract <code>iss</code>, <code>sub</code>, <code>iat</code>, <code>nbf</code>,
<code>exp</code>, <code>jti</code>, and <code>aud</code> as registered claims.
<code>exp</code>, <code>jti</code>, and <code>aud</code> as <a href="#registered-claim-names">registered claims</a>.
</li>
<li>
Set aside all other claims as subject claims.
Expand Down