From ecfeb5530805a68e04d1f8d7bdfe97769ef29668 Mon Sep 17 00:00:00 2001
From: Adam Langley <agl@google.com>
Date: Wed, 11 Dec 2024 20:13:23 +0000
Subject: [PATCH] Merge pull request #2215 from
 w3c/issue-2204-premature-store-credential

SHA: 08d33dc98f8012d01e7edc81f052c785af7726af
Reason: push, by agl

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 108 ++++++++++++++++++++++++++---------------------------
 1 file changed, 54 insertions(+), 54 deletions(-)

diff --git a/index.html b/index.html
index 01d95f54b..b1a4004c4 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,7 @@
   <meta content="ED" name="w3c-status">
   <meta content="Bikeshed version ac5ea272d, updated Fri Dec 6 15:45:15 2024 -0800" name="generator">
   <link href="https://www.w3.org/TR/webauthn-3/" rel="canonical">
-  <meta content="09969718b3cb9dbbfe020bf5cd1d3a0086d2a696" name="revision">
+  <meta content="08d33dc98f8012d01e7edc81f052c785af7726af" name="revision">
   <meta content="dark light" name="color-scheme">
 <style type="text/css">
 body {
@@ -6333,15 +6333,18 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
        <p>Otherwise, use the X.509 certificates returned as the <a data-link-type="dfn" href="#attestation-trust-path" id="ref-for-attestation-trust-path②">attestation trust path</a> from the <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure⑥">verification procedure</a> to verify that the attestation public key either correctly chains up to an acceptable root certificate, or is itself an acceptable certificate
 (i.e., it and the root certificate obtained in <a href="#reg-ceremony-attestation-trust-anchors">step 22</a> may be the same).</p>
      </ul>
-    <li data-md>
-     <p>Verify that the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid④">credentialId</a></code> is ≤ 1023 bytes. Credential IDs larger than this many bytes SHOULD cause the RP to fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①③">registration ceremony</a>.</p>
-    <li data-md>
-     <p>Verify that the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid⑤">credentialId</a></code> is not yet registered for any user. If the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid⑥">credentialId</a></code> is already known then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑦">Relying Party</a> SHOULD fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①④">registration ceremony</a>.</p>
-     <p class="note" role="note"><span class="marker">NOTE:</span> The rationale for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑧">Relying Parties</a> rejecting duplicate <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑧">credential IDs</a> is as follows: <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑨">credential IDs</a> contain sufficient entropy that accidental duplication is very unlikely. However, <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⑥">attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑤">self attestation</a> do not include a self-signature to explicitly prove possession of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑤">credential private key</a> at <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑨">registration</a> time. Thus an attacker who has managed to obtain a user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⓪">credential ID</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⓪">credential public key</a> for a site (this could be potentially accomplished in various ways), could attempt to register a victim’s credential as their own at that site. If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑨">Relying Party</a> accepts this new registration and replaces the victim’s existing credential registration, and the <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑤">credentials are discoverable</a>, then the victim could be forced to sign into the attacker’s account at their next attempt. Data saved to the site by the victim in that state would then be available to the attacker.</p>
-    <li id="reg-ceremony-store-credential-record">
-     <a class="self-link" href="#reg-ceremony-store-credential-record"></a> If the attestation statement <var>attStmt</var> verified successfully and is found to be trustworthy,
-    then create and store a new <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record①⓪">credential record</a> in the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③②">user account</a> that was denoted in <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑦">user</a></code></code>,
-    with the following contents: 
+     <p>If the attestation statement is not deemed trustworthy, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑦">Relying Party</a> SHOULD fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①③">registration ceremony</a>.</p>
+     <p class="note" role="note"><span class="marker">NOTE:</span> However, if permitted by policy, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑧">Relying Party</a> MAY register the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑧">credential ID</a> and credential public key but treat the
+        credential as one with <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑤">self attestation</a> (see <a href="#sctn-attestation-types">§ 6.5.3 Attestation Types</a>). If doing so, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑨">Relying Party</a> is asserting there
+        is no cryptographic proof that the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑥">public key credential</a> has been generated by a particular <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑥">authenticator</a> model.
+        See <a data-link-type="biblio" href="#biblio-fidosecref" title="FIDO Security Reference">[FIDOSecRef]</a> and <a data-link-type="biblio" href="#biblio-uafprotocol" title="FIDO UAF Protocol Specification v1.0">[UAFProtocol]</a> for a more detailed discussion.</p>
+    <li data-md>
+     <p>Verify that the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid④">credentialId</a></code> is ≤ 1023 bytes. Credential IDs larger than this many bytes SHOULD cause the RP to fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①④">registration ceremony</a>.</p>
+    <li data-md>
+     <p>Verify that the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid⑤">credentialId</a></code> is not yet registered for any user. If the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid⑥">credentialId</a></code> is already known then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⓪">Relying Party</a> SHOULD fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑤">registration ceremony</a>.</p>
+     <p class="note" role="note"><span class="marker">NOTE:</span> The rationale for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥①">Relying Parties</a> rejecting duplicate <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑨">credential IDs</a> is as follows: <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⓪">credential IDs</a> contain sufficient entropy that accidental duplication is very unlikely. However, <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⑥">attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑥">self attestation</a> do not include a self-signature to explicitly prove possession of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑤">credential private key</a> at <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑨">registration</a> time. Thus an attacker who has managed to obtain a user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④①">credential ID</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⓪">credential public key</a> for a site (this could be potentially accomplished in various ways), could attempt to register a victim’s credential as their own at that site. If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥②">Relying Party</a> accepts this new registration and replaces the victim’s existing credential registration, and the <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑤">credentials are discoverable</a>, then the victim could be forced to sign into the attacker’s account at their next attempt. Data saved to the site by the victim in that state would then be available to the attacker.</p>
+    <li id="reg-ceremony-create-credential-record">
+     <a class="self-link" href="#reg-ceremony-create-credential-record"></a> Let <var>credentialRecord</var> be a new <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record①⓪">credential record</a> with the following contents: 
      <dl>
       <dt data-md><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-type" id="ref-for-abstract-opdef-credential-record-type②">type</a>
       <dd data-md>
@@ -6349,7 +6352,7 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
       <dt data-md><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-id" id="ref-for-abstract-opdef-credential-record-id②">id</a>
       <dd data-md>
        <p><code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-id" id="ref-for-dom-credential-id①">id</a></code></code> or <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-rawid" id="ref-for-dom-publickeycredential-rawid②">rawId</a></code></code>,
-whichever format is preferred by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⓪">Relying Party</a>.</p>
+whichever format is preferred by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥③">Relying Party</a>.</p>
       <dt data-md><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-publickey" id="ref-for-abstract-opdef-credential-record-publickey">publicKey</a>
       <dd data-md>
        <p>The <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③①">credential public key</a> in <var>authData</var>.</p>
@@ -6378,28 +6381,25 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
       <dd data-md>
        <p><code><var>response</var>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorresponse-clientdatajson" id="ref-for-dom-authenticatorresponse-clientdatajson⑨">clientDataJSON</a></code></code>.</p>
      </dl>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥①">Relying Party</a> MAY also include any additional <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct-item" id="ref-for-struct-item①②">items</a> as necessary.
-    As a non-normative example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥②">Relying Party</a> might allow the user to set a "nickname" for the credential
-    to help the user remember which <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②③">credential</a> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑤">bound</a> to which <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑥">authenticator</a> when interacting with account settings.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥④">Relying Party</a> MAY also include any additional <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct-item" id="ref-for-struct-item①②">items</a> as necessary.
+    As a non-normative example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑤">Relying Party</a> might allow the user to set a "nickname" for the credential
+    to help the user remember which <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②③">credential</a> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑤">bound</a> to which <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑦">authenticator</a> when interacting with account settings.</p>
     <li id="reg-ceremony-verify-extension-outputs">
-     <a class="self-link" href="#reg-ceremony-verify-extension-outputs"></a> Process the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑥">client extension outputs</a> in <var>clientExtensionResults</var> and the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output③">authenticator extension outputs</a> in the <code><a data-link-type="dfn" href="#authdata-extensions" id="ref-for-authdata-extensions⑦">extensions</a></code> in <var>authData</var> as required by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥③">Relying Party</a>.
+     <a class="self-link" href="#reg-ceremony-verify-extension-outputs"></a> Process the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑥">client extension outputs</a> in <var>clientExtensionResults</var> and the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output③">authenticator extension outputs</a> in the <code><a data-link-type="dfn" href="#authdata-extensions" id="ref-for-authdata-extensions⑦">extensions</a></code> in <var>authData</var> as required by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑥">Relying Party</a>.
     Depending on each <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions①⓪">extension</a>,
-    processing steps may be concretely specified or it may be up to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥④">Relying Party</a> what to do with extension outputs.
-    The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑤">Relying Party</a> MAY ignore any or all extension outputs. 
+    processing steps may be concretely specified or it may be up to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑦">Relying Party</a> what to do with extension outputs.
+    The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑧">Relying Party</a> MAY ignore any or all extension outputs. 
      <p><a data-link-type="dfn" href="#client" id="ref-for-client⑨⑥">Clients</a> MAY set additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension③">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension②">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output④">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑦">client extension outputs</a> that were not
-    requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑥">Relying Party</a> in <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions④">extensions</a></code></code>.
-    The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑦">Relying Party</a> MUST be prepared to handle such situations,
-    whether by ignoring the unsolicited extensions or by rejecting the attestation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑧">Relying Party</a> can make this
+    requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑨">Relying Party</a> in <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions④">extensions</a></code></code>.
+    The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⓪">Relying Party</a> MUST be prepared to handle such situations,
+    whether by ignoring the unsolicited extensions or by rejecting the attestation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦①">Relying Party</a> can make this
     decision based on local policy and the extensions in use.</p>
-     <p>Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑦">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑦">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑨">Relying Party</a> MUST also be
+     <p>Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑦">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑧">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦②">Relying Party</a> MUST also be
     prepared to handle cases where none or not all of the requested extensions were acted upon.</p>
     <li data-md>
-     <p>If the attestation statement <var>attStmt</var> successfully verified but is not trustworthy per <a href="#reg-ceremony-assess-trust">step 23</a> above,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⓪">Relying Party</a> SHOULD fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑤">registration ceremony</a>.</p>
-     <p class="note" role="note"><span class="marker">NOTE:</span> However, if permitted by policy, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦①">Relying Party</a> MAY register the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④①">credential ID</a> and credential public key but treat the
-    credential as one with <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑥">self attestation</a> (see <a href="#sctn-attestation-types">§ 6.5.3 Attestation Types</a>). If doing so, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦②">Relying Party</a> is asserting there
-    is no cryptographic proof that the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑥">public key credential</a> has been generated by a particular <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑧">authenticator</a> model.
-    See <a data-link-type="biblio" href="#biblio-fidosecref" title="FIDO Security Reference">[FIDOSecRef]</a> and <a data-link-type="biblio" href="#biblio-uafprotocol" title="FIDO UAF Protocol Specification v1.0">[UAFProtocol]</a> for a more detailed discussion.</p>
+     <p>If all the above steps are successful,
+store <var>credentialRecord</var> in the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③②">user account</a> that was denoted in <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑦">user</a></code></code> and continue the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑥">registration ceremony</a> as appropriate.
+Otherwise, fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑦">registration ceremony</a>.</p>
    </ol>
    <p>Verification of <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑥">attestation objects</a> requires that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦③">Relying Party</a> has a trusted method of determining acceptable trust anchors
 in <a href="#reg-ceremony-attestation-trust-anchors">step 22</a> above.
@@ -6529,6 +6529,18 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
          <p>For more information on signature counter considerations, see <a href="#sctn-sign-counter">§ 6.1.1 Signature Counter Considerations</a>.</p>
        </dl>
      </ul>
+    <li id="authn-ceremony-verify-extension-outputs">
+     <a class="self-link" href="#authn-ceremony-verify-extension-outputs"></a> Process the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑧">client extension outputs</a> in <var>clientExtensionResults</var> and the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑤">authenticator extension outputs</a> in the <code><a data-link-type="dfn" href="#authdata-extensions" id="ref-for-authdata-extensions⑧">extensions</a></code> in <var>authData</var> as required by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⓪">Relying Party</a>.
+    Depending on each <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions①①">extension</a>,
+    processing steps may be concretely specified or it may be up to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨①">Relying Party</a> what to do with extension outputs.
+    The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨②">Relying Party</a> MAY ignore any or all extension outputs. 
+     <p><a data-link-type="dfn" href="#client" id="ref-for-client⑨⑧">Clients</a> MAY set additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension④">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension③">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑥">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑨">client extension outputs</a> that were not
+    requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨③">Relying Party</a> in <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions④">extensions</a></code></code>.
+    The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨④">Relying Party</a> MUST be prepared to handle such situations,
+    whether by ignoring the unsolicited extensions or by rejecting the assertion. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑤">Relying Party</a> can make this
+    decision based on local policy and the extensions in use.</p>
+     <p>Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑨">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑨">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑥">Relying Party</a> MUST also be
+    prepared to handle cases where none or not all of the requested extensions were acted upon.</p>
     <li id="authn-ceremony-update-credential-record">
      <a class="self-link" href="#authn-ceremony-update-credential-record"></a> Update <var>credentialRecord</var> with new state values: 
      <ol>
@@ -6542,22 +6554,10 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
 This change SHOULD require authorization by an additional <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②④">authentication factor</a> equivalent to WebAuthn <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⓪">user verification</a>;
 if not authorized, skip this step.</p>
      </ol>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⓪">Relying Party</a> performs additional security checks beyond these WebAuthn <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑤">authentication ceremony</a> steps,
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑦">Relying Party</a> performs additional security checks beyond these WebAuthn <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑤">authentication ceremony</a> steps,
     the above state updates SHOULD be deferred to after those additional checks are completed successfully.</p>
-    <li id="authn-ceremony-verify-extension-outputs">
-     <a class="self-link" href="#authn-ceremony-verify-extension-outputs"></a> Process the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑧">client extension outputs</a> in <var>clientExtensionResults</var> and the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑤">authenticator extension outputs</a> in the <code><a data-link-type="dfn" href="#authdata-extensions" id="ref-for-authdata-extensions⑧">extensions</a></code> in <var>authData</var> as required by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨①">Relying Party</a>.
-    Depending on each <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions①①">extension</a>,
-    processing steps may be concretely specified or it may be up to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨②">Relying Party</a> what to do with extension outputs.
-    The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨③">Relying Party</a> MAY ignore any or all extension outputs. 
-     <p><a data-link-type="dfn" href="#client" id="ref-for-client⑨⑧">Clients</a> MAY set additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension④">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension③">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑥">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑨">client extension outputs</a> that were not
-    requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨④">Relying Party</a> in <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions④">extensions</a></code></code>.
-    The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑤">Relying Party</a> MUST be prepared to handle such situations,
-    whether by ignoring the unsolicited extensions or by rejecting the assertion. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑥">Relying Party</a> can make this
-    decision based on local policy and the extensions in use.</p>
-     <p>Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑨">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑨">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑦">Relying Party</a> MUST also be
-    prepared to handle cases where none or not all of the requested extensions were acted upon.</p>
     <li data-md>
-     <p>If all the above steps are successful, continue with the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑥">authentication ceremony</a> as appropriate. Otherwise, fail the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑦">authentication ceremony</a>.</p>
+     <p>If all the above steps are successful, continue the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑥">authentication ceremony</a> as appropriate. Otherwise, fail the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑦">authentication ceremony</a>.</p>
    </ol>
    <h2 class="heading settled" data-level="8" id="sctn-defined-attestation-formats"><span class="secno">8. </span><span class="content">Defined Attestation Statement Formats</span><a class="self-link" href="#sctn-defined-attestation-formats"></a></h2>
    <p>WebAuthn supports pluggable attestation statement formats. This section defines an initial set of such formats.</p>
@@ -7555,7 +7555,7 @@ <h4 class="heading settled" data-level="10.1.2" id="sctn-appid-exclude-extension
      <p>None.</p>
    </dl>
    <h4 class="heading settled" data-level="10.1.3" id="sctn-authenticator-credential-properties-extension"><span class="secno">10.1.3. </span><span class="content">Credential Properties Extension (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="credprops">credProps</dfn>)</span><a class="self-link" href="#sctn-authenticator-credential-properties-extension"></a></h4>
-   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑧">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension⑨">registration extension</a> facilitates reporting certain <a data-link-type="dfn" href="#credential-properties" id="ref-for-credential-properties②">credential properties</a> known by the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑤">client</a> to the requesting <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⑨">WebAuthn Relying Party</a> upon creation of a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥⑦">public key credential source</a> as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑥">registration ceremony</a>.</p>
+   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑧">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension⑨">registration extension</a> facilitates reporting certain <a data-link-type="dfn" href="#credential-properties" id="ref-for-credential-properties②">credential properties</a> known by the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑤">client</a> to the requesting <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⑨">WebAuthn Relying Party</a> upon creation of a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥⑦">public key credential source</a> as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑧">registration ceremony</a>.</p>
    <p>At this time, one <a data-link-type="dfn" href="#credential-properties" id="ref-for-credential-properties③">credential property</a> is defined: the <a data-link-type="dfn" href="#credentialpropertiesoutput-client-side-discoverable-credential-property" id="ref-for-credentialpropertiesoutput-client-side-discoverable-credential-property">client-side discoverable credential property</a>.</p>
    <dl>
     <dt data-md>Extension identifier
@@ -7590,7 +7590,7 @@ <h4 class="heading settled" data-level="10.1.3" id="sctn-authenticator-credentia
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dict-member" data-export id="dom-credentialpropertiesoutput-rk"><code>rk</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①①">boolean</a></span>
        <dd data-md>
         <p>This OPTIONAL property, known abstractly as the <dfn class="dfn-paneled" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dfn" data-noexport id="credentialpropertiesoutput-client-side-discoverable-credential-property">client-side discoverable credential property</dfn> or as the <dfn class="dfn-paneled" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dfn" data-noexport id="credentialpropertiesoutput-resident-key-credential-property">resident key credential property</dfn>,
-is a Boolean value indicating whether the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential③①">PublicKeyCredential</a></code> returned as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑦">registration ceremony</a> is a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①⑤">client-side discoverable credential</a>.
+is a Boolean value indicating whether the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential③①">PublicKeyCredential</a></code> returned as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑨">registration ceremony</a> is a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①⑤">client-side discoverable credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk③">rk</a></code> is <code>true</code>, the credential is a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑥">discoverable credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk④">rk</a></code> is <code>false</code>, the credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①②">server-side credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑤">rk</a></code> is not present, it is not known whether the credential is a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑦">discoverable credential</a> or a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①③">server-side credential</a>.</p>
@@ -7732,7 +7732,7 @@ <h5 class="heading settled" data-level="10.1.4.1" id="prf-extension-test-vectors
 The examples are not exhaustive.</p>
    <ul>
     <li data-md>
-     <p>The <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfoutputs-enabled" id="ref-for-dom-authenticationextensionsprfoutputs-enabled③">enabled</a></code> output is always present during <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑧">registration ceremonies</a>,
+     <p>The <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfoutputs-enabled" id="ref-for-dom-authenticationextensionsprfoutputs-enabled③">enabled</a></code> output is always present during <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⓪">registration ceremonies</a>,
 and never present during <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑧">authentication ceremonies</a>:</p>
 <pre class="example highlight" id="example-5584eab4"><a class="self-link" href="#example-5584eab4"></a><c- c1>// Example extension inputs:</c->
 <c- p>{</c-> prf<c- o>:</c-> <c- p>{}</c-> <c- p>}</c->
@@ -7746,7 +7746,7 @@ <h5 class="heading settled" data-level="10.1.4.1" id="prf-extension-test-vectors
 </pre>
     <li data-md>
      <p>The <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfoutputs-results" id="ref-for-dom-authenticationextensionsprfoutputs-results⑤">results</a></code> output may be present
-during <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑨">registration ceremonies</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑨">authentication ceremonies</a> if the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-eval" id="ref-for-dom-authenticationextensionsprfinputs-eval⑨">eval</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-evalbycredential" id="ref-for-dom-authenticationextensionsprfinputs-evalbycredential⑥">evalByCredential</a></code> input is present:</p>
+during <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②①">registration ceremonies</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑨">authentication ceremonies</a> if the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-eval" id="ref-for-dom-authenticationextensionsprfinputs-eval⑨">eval</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-evalbycredential" id="ref-for-dom-authenticationextensionsprfinputs-evalbycredential⑥">evalByCredential</a></code> input is present:</p>
 <pre class="example highlight" id="example-70210d97"><a class="self-link" href="#example-70210d97"></a><c- c1>// Example extension inputs:</c->
 <c- p>{</c-> prf<c- o>:</c-> <c- p>{</c-> eval<c- o>:</c-> <c- p>{</c-> first<c- o>:</c-> <c- ow>new</c-> Uint8Array<c- p>([</c-><c- mf>1</c-><c- p>,</c-> <c- mf>2</c-><c- p>,</c-> <c- mf>3</c-><c- p>,</c-> <c- mf>4</c-><c- p>])</c-> <c- p>}</c-> <c- p>}</c-> <c- p>}</c->
 
@@ -8855,7 +8855,7 @@ <h4 class="heading settled" data-level="13.4.1" id="sctn-rp-benefits"><span clas
 enforce requirements on <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑤">authenticators</a>' security properties by inspecting the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑨">attestation statements</a> returned from the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑥">authenticators</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⓪">Authentication ceremonies</a> are resistant to <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186">man-in-the-middle attacks</a>.
-Regarding <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⓪">registration ceremonies</a>, see <a href="#sctn-attestation-limitations">§ 13.4.4 Attestation Limitations</a>, below.</p>
+Regarding <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②②">registration ceremonies</a>, see <a href="#sctn-attestation-limitations">§ 13.4.4 Attestation Limitations</a>, below.</p>
     <li data-md>
      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④③">Relying Party</a> can automatically support multiple types of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑦">user verification</a> - for example PIN, biometrics and/or future
 methods - with little or no code change, and can let each user decide which they prefer to use via their choice of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑦">authenticator</a>.</p>
@@ -8890,7 +8890,7 @@ <h4 class="heading settled" data-level="13.4.4" id="sctn-attestation-limitations
 For example, such an attacker could use malicious code injected into <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤③">Relying Party</a> script.
 The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤④">Relying Party</a> must therefore rely on other means, e.g., TLS and related technologies,
 to protect the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑨">attestation object</a> from <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186②">man-in-the-middle attacks</a>.</p>
-   <p>Under the assumption that a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②①">registration ceremony</a> is completed securely, and that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨①">authenticator</a> maintains
+   <p>Under the assumption that a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②③">registration ceremony</a> is completed securely, and that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨①">authenticator</a> maintains
 confidentiality of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑧">credential private key</a>, subsequent <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④①">authentication ceremonies</a> using that <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥①">public key
 credential</a> are resistant to tampering by <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186③">man-in-the-middle attacks</a>.</p>
    <p>The discussion above holds for all <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②④">attestation types</a>. In all cases it is possible for a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186④">man-in-the-middle attacker</a> to replace the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential③④">PublicKeyCredential</a></code> object, including the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④②">attestation statement</a> and the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑥">credential public key</a> to be registered, and subsequently tamper with future <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑦">authentication assertions</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope②③">scoped</a> for the
@@ -9152,7 +9152,7 @@ <h4 class="heading settled" data-level="14.6.1" id="sctn-user-handle-privacy"><s
 function is <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258">salted</a> with <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258①">salt</a> values private to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑦">Relying Party</a>, since hashing does not prevent probing for guessable input
 values. It is RECOMMENDED to let the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle③①">user handle</a> be 64 random bytes, and store this value in the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account④②">user account</a>.</p>
    <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><span class="secno">14.6.2. </span><span class="content">Username Enumeration</span><a class="self-link" href="#sctn-username-enumeration"></a></h4>
-   <p>While initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②②">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⑧">authentication ceremony</a>, there is a risk that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑦⑥">WebAuthn Relying Party</a> might leak sensitive
+   <p>While initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②④">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⑧">authentication ceremony</a>, there is a risk that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑦⑥">WebAuthn Relying Party</a> might leak sensitive
 information about its registered users. For example, if a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑧">Relying Party</a> uses e-mail addresses as usernames and an attacker attempts to
 initiate an <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑧">authentication</a> <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑥">ceremony</a> for "alex.mueller@example.com" and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑨">Relying Party</a> responds with a failure, but then
 successfully initiates an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⑨">authentication ceremony</a> for "j.doe@example.com", then the attacker can conclude that "j.doe@example.com"
@@ -9162,15 +9162,15 @@ <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><
 leakage due to such an attack:</p>
    <ul>
     <li data-md>
-     <p>For <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②③">registration ceremonies</a>:</p>
+     <p>For <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑤">registration ceremonies</a>:</p>
      <ul>
       <li data-md>
        <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②③">Relying Party</a> uses <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②④">Relying Party</a>-specific usernames to identify users:</p>
        <ul>
         <li data-md>
-         <p>When initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②④">registration ceremony</a>, disallow registration of usernames that are syntactically valid e-mail
+         <p>When initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑥">registration ceremony</a>, disallow registration of usernames that are syntactically valid e-mail
 addresses.</p>
-         <p class="note" role="note"><span class="marker">Note:</span> The motivation for this suggestion is that in this case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑤">Relying Party</a> probably has no choice but to fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑤">registration ceremony</a> if the user attempts to register a username that is already registered, and an information
+         <p class="note" role="note"><span class="marker">Note:</span> The motivation for this suggestion is that in this case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑤">Relying Party</a> probably has no choice but to fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑦">registration ceremony</a> if the user attempts to register a username that is already registered, and an information
 leak might therefore be unavoidable. By disallowing e-mail addresses as usernames, the impact of the leakage can be
 mitigated since it will be less likely that a user has the same username at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑥">Relying Party</a> as at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑦">Relying Parties</a>.</p>
        </ul>
@@ -9178,7 +9178,7 @@ <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><
        <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑧">Relying Party</a> uses e-mail addresses to identify users:</p>
        <ul>
         <li data-md>
-         <p>When initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑥">registration ceremony</a>, interrupt the user interaction after the e-mail address is supplied and
+         <p>When initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑧">registration ceremony</a>, interrupt the user interaction after the e-mail address is supplied and
 send a message to this address, containing an unpredictable one-time code and instructions for how to use it to
 proceed with the ceremony. Display the same message to the user in the web interface regardless of the contents of the
 sent e-mail and whether or not this e-mail address was already registered.</p>
@@ -9242,7 +9242,7 @@ <h2 class="heading settled" data-level="15" id="sctn-accessiblility-consideratio
    <p><a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑥⑤">User verification</a>-capable <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③④②">authenticators</a>, whether <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑥">roaming</a> or <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③⑤">platform</a>, should offer users more than one user verification method.  For example, both fingerprint sensing and PIN entry. This allows for fallback to other user verification means if the selected one is not working for some reason. Note that in the case of <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑦">roaming authenticators</a>, the authenticator and platform might work together to provide a user verification method such as PIN entry <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a>.</p>
    <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑤">Relying Parties</a>, at <a data-link-type="dfn" href="#registration" id="ref-for-registration②⑦">registration</a> time, SHOULD provide affordances for users to complete future <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture②⑨">authorization gestures</a> correctly. This could involve naming the authenticator, choosing a picture to associate with the device, or entering freeform text instructions (e.g., as a reminder-to-self).</p>
    <h3 class="heading settled" data-level="15.1" id="sctn-timeout-recommended-range"><span class="secno">15.1. </span><span class="content">Recommended Range for Ceremony Timeouts</span><a class="self-link" href="#sctn-timeout-recommended-range"></a></h3>
-   <p><a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑧">Ceremonies</a> relying on timing, e.g., a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑦">registration ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout④">timeout</a></code>) or an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony⑤⑤">authentication ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout④">timeout</a></code>), ought to follow <a data-link-type="biblio" href="#biblio-wcag21" title="Web Content Accessibility Guidelines (WCAG) 2.1">[WCAG21]</a>'s <a href="https://www.w3.org/TR/WCAG21/#enough-time">Guideline 2.2 Enough Time</a>. If a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑥">client platform</a> determines that a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑥">Relying Party</a>-supplied timeout does not appropriately adhere to the latter <a data-link-type="biblio" href="#biblio-wcag21" title="Web Content Accessibility Guidelines (WCAG) 2.1">[WCAG21]</a> guidelines, then the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑦">client platform</a> MAY adjust the timeout accordingly.</p>
+   <p><a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑧">Ceremonies</a> relying on timing, e.g., a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑨">registration ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout④">timeout</a></code>) or an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony⑤⑤">authentication ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout④">timeout</a></code>), ought to follow <a data-link-type="biblio" href="#biblio-wcag21" title="Web Content Accessibility Guidelines (WCAG) 2.1">[WCAG21]</a>'s <a href="https://www.w3.org/TR/WCAG21/#enough-time">Guideline 2.2 Enough Time</a>. If a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑥">client platform</a> determines that a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑥">Relying Party</a>-supplied timeout does not appropriately adhere to the latter <a data-link-type="biblio" href="#biblio-wcag21" title="Web Content Accessibility Guidelines (WCAG) 2.1">[WCAG21]</a> guidelines, then the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑦">client platform</a> MAY adjust the timeout accordingly.</p>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recommended-range-and-default-for-a-webauthn-ceremony-timeout">recommended range and default for a WebAuthn ceremony timeout</dfn> is as follows:</p>
    <ul>
     <li data-md>
@@ -11960,7 +11960,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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Other Use Cases and Configurations"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467"},{"id":"ref-for-relying-party\u2460\u2468"},{"id":"ref-for-relying-party\u2461\u24ea"},{"id":"ref-for-relying-party\u2461\u2460"}],"title":"1.3.1. Registration"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461"},{"id":"ref-for-relying-party\u2461\u2462"},{"id":"ref-for-relying-party\u2461\u2463"}],"title":"1.3.2. Registration Specifically with User-Verifying Platform Authenticator"},{"refs":[{"id":"ref-for-relying-party\u2461\u2464"},{"id":"ref-for-relying-party\u2461\u2465"},{"id":"ref-for-relying-party\u2461\u2466"},{"id":"ref-for-relying-party\u2461\u2467"},{"id":"ref-for-relying-party\u2461\u2468"}],"title":"1.3.3. Authentication"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea"},{"id":"ref-for-relying-party\u2462\u2460"}],"title":"1.3.5. Decommissioning"},{"refs":[{"id":"ref-for-relying-party\u2462\u2461"}],"title":"2.1.1. 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Easily accessing credential data"},{"refs":[{"id":"ref-for-relying-party\u2460\u2460\u2468"},{"id":"ref-for-relying-party\u2460\u2461\u24ea"},{"id":"ref-for-relying-party\u2460\u2461\u2460"},{"id":"ref-for-relying-party\u2460\u2461\u2461"},{"id":"ref-for-relying-party\u2460\u2461\u2462"},{"id":"ref-for-relying-party\u2460\u2461\u2463"},{"id":"ref-for-relying-party\u2460\u2461\u2464"},{"id":"ref-for-relying-party\u2460\u2461\u2465"},{"id":"ref-for-relying-party\u2460\u2461\u2466"},{"id":"ref-for-relying-party\u2460\u2461\u2467"},{"id":"ref-for-relying-party\u2460\u2461\u2468"}],"title":"5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2462\u24ea"},{"id":"ref-for-relying-party\u2460\u2462\u2460"},{"id":"ref-for-relying-party\u2460\u2462\u2461"},{"id":"ref-for-relying-party\u2460\u2462\u2462"},{"id":"ref-for-relying-party\u2460\u2462\u2463"},{"id":"ref-for-relying-party\u2460\u2462\u2464"},{"id":"ref-for-relying-party\u2460\u2462\u2465"}],"title":"5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2462\u2466"},{"id":"ref-for-relying-party\u2460\u2462\u2467"}],"title":"5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2462\u2468"},{"id":"ref-for-relying-party\u2460\u2463\u24ea"},{"id":"ref-for-relying-party\u2460\u2463\u2460"},{"id":"ref-for-relying-party\u2460\u2463\u2461"},{"id":"ref-for-relying-party\u2460\u2463\u2462"}],"title":"5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2463\u2463"},{"id":"ref-for-relying-party\u2460\u2463\u2464"},{"id":"ref-for-relying-party\u2460\u2463\u2465"}],"title":"5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2463\u2466"},{"id":"ref-for-relying-party\u2460\u2463\u2467"},{"id":"ref-for-relying-party\u2460\u2463\u2468"}],"title":"5.4.5. 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Authentication Factor Capability"},{"refs":[{"id":"ref-for-relying-party\u2461\u2460\u2465"},{"id":"ref-for-relying-party\u2461\u2460\u2466"},{"id":"ref-for-relying-party\u2461\u2460\u2467"},{"id":"ref-for-relying-party\u2461\u2460\u2468"},{"id":"ref-for-relying-party\u2461\u2461\u24ea"},{"id":"ref-for-relying-party\u2461\u2461\u2460"},{"id":"ref-for-relying-party\u2461\u2461\u2461"}],"title":"6.3.2. The authenticatorMakeCredential Operation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2462"},{"id":"ref-for-relying-party\u2461\u2461\u2463"},{"id":"ref-for-relying-party\u2461\u2461\u2464"}],"title":"6.3.3. The authenticatorGetAssertion Operation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2465"}],"title":"6.4. String Handling"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2466"}],"title":"6.4.1.1. String Truncation by Clients"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2467"},{"id":"ref-for-relying-party\u2461\u2461\u2468"},{"id":"ref-for-relying-party\u2461\u2462\u24ea"},{"id":"ref-for-relying-party\u2461\u2462\u2460"},{"id":"ref-for-relying-party\u2461\u2462\u2461"},{"id":"ref-for-relying-party\u2461\u2462\u2462"},{"id":"ref-for-relying-party\u2461\u2462\u2463"},{"id":"ref-for-relying-party\u2461\u2462\u2464"}],"title":"6.5. Attestation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2462\u2465"},{"id":"ref-for-relying-party\u2461\u2462\u2466"},{"id":"ref-for-relying-party\u2461\u2462\u2467"},{"id":"ref-for-relying-party\u2461\u2462\u2468"},{"id":"ref-for-relying-party\u2461\u2463\u24ea"}],"title":"6.5.3. Attestation Types"},{"refs":[{"id":"ref-for-relying-party\u2461\u2463\u2460"},{"id":"ref-for-relying-party\u2461\u2463\u2461"},{"id":"ref-for-relying-party\u2461\u2463\u2462"},{"id":"ref-for-relying-party\u2461\u2463\u2463"}],"title":"7. 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Registering a New Credential"},{"refs":[{"id":"ref-for-relying-party\u2461\u2466\u2465"},{"id":"ref-for-relying-party\u2461\u2466\u2466"},{"id":"ref-for-relying-party\u2461\u2466\u2467"},{"id":"ref-for-relying-party\u2461\u2466\u2468"},{"id":"ref-for-relying-party\u2461\u2467\u24ea"},{"id":"ref-for-relying-party\u2461\u2467\u2460"},{"id":"ref-for-relying-party\u2461\u2467\u2461"},{"id":"ref-for-relying-party\u2461\u2467\u2462"},{"id":"ref-for-relying-party\u2461\u2467\u2463"},{"id":"ref-for-relying-party\u2461\u2467\u2464"},{"id":"ref-for-relying-party\u2461\u2467\u2465"},{"id":"ref-for-relying-party\u2461\u2467\u2466"},{"id":"ref-for-relying-party\u2461\u2467\u2467"},{"id":"ref-for-relying-party\u2461\u2467\u2468"},{"id":"ref-for-relying-party\u2461\u2468\u24ea"},{"id":"ref-for-relying-party\u2461\u2468\u2460"},{"id":"ref-for-relying-party\u2461\u2468\u2461"},{"id":"ref-for-relying-party\u2461\u2468\u2462"},{"id":"ref-for-relying-party\u2461\u2468\u2463"},{"id":"ref-for-relying-party\u2461\u2468\u2464"},{"id":"ref-for-relying-party\u2461\u2468\u2465"},{"id":"ref-for-relying-party\u2461\u2468\u2466"}],"title":"7.2. Verifying an Authentication Assertion"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2467"},{"id":"ref-for-relying-party\u2461\u2468\u2468"}],"title":"8.2.1. Certificate Requirements for Packed Attestation Statements"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u24ea"},{"id":"ref-for-relying-party\u2462\u24ea\u2460"}],"title":"8.9. Compound Attestation Statement Format"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2461"},{"id":"ref-for-relying-party\u2462\u24ea\u2462"},{"id":"ref-for-relying-party\u2462\u24ea\u2463"}],"title":"9. WebAuthn Extensions"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2464"}],"title":"9.2. Defining Extensions"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2465"},{"id":"ref-for-relying-party\u2462\u24ea\u2466"},{"id":"ref-for-relying-party\u2462\u24ea\u2467"}],"title":"9.3. Extending Request Parameters"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2468"}],"title":"9.5. Authenticator Extension Processing"},{"refs":[{"id":"ref-for-relying-party\u2462\u2460\u24ea"},{"id":"ref-for-relying-party\u2462\u2460\u2460"},{"id":"ref-for-relying-party\u2462\u2460\u2461"},{"id":"ref-for-relying-party\u2462\u2460\u2462"},{"id":"ref-for-relying-party\u2462\u2460\u2463"}],"title":"10.1.1. FIDO AppID Extension (appid)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2460\u2464"},{"id":"ref-for-relying-party\u2462\u2460\u2465"}],"title":"10.1.2. FIDO AppID Exclusion Extension (appidExclude)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2460\u2466"},{"id":"ref-for-relying-party\u2462\u2460\u2467"}],"title":"10.1.3. Credential Properties Extension (credProps)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2460\u2468"},{"id":"ref-for-relying-party\u2462\u2461\u24ea"},{"id":"ref-for-relying-party\u2462\u2461\u2460"}],"title":"10.1.4. Pseudo-random function extension (prf)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2461\u2461"},{"id":"ref-for-relying-party\u2462\u2461\u2462"},{"id":"ref-for-relying-party\u2462\u2461\u2463"},{"id":"ref-for-relying-party\u2462\u2461\u2464"},{"id":"ref-for-relying-party\u2462\u2461\u2465"},{"id":"ref-for-relying-party\u2462\u2461\u2466"},{"id":"ref-for-relying-party\u2462\u2461\u2467"},{"id":"ref-for-relying-party\u2462\u2461\u2468"}],"title":"10.1.5. Large blob storage extension (largeBlob)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u24ea"}],"title":"12.4. WebAuthn Extension Identifier Registrations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2460"},{"id":"ref-for-relying-party\u2462\u2462\u2461"},{"id":"ref-for-relying-party\u2462\u2462\u2462"},{"id":"ref-for-relying-party\u2462\u2462\u2463"}],"title":"13. Security Considerations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2464"},{"id":"ref-for-relying-party\u2462\u2462\u2465"}],"title":"13.2. Physical Proximity between Client and Authenticator"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2466"},{"id":"ref-for-relying-party\u2462\u2462\u2467"}],"title":"13.3.2. Attestation Certificate and Attestation Certificate CA Compromise"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2468"}],"title":"13.4. Security considerations for Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2462\u2463\u24ea"},{"id":"ref-for-relying-party\u2462\u2463\u2460"},{"id":"ref-for-relying-party\u2462\u2463\u2461"},{"id":"ref-for-relying-party\u2462\u2463\u2462"},{"id":"ref-for-relying-party\u2462\u2463\u2463"},{"id":"ref-for-relying-party\u2462\u2463\u2464"}],"title":"13.4.1. Security Benefits for WebAuthn Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2462\u2463\u2465"},{"id":"ref-for-relying-party\u2462\u2463\u2466"},{"id":"ref-for-relying-party\u2462\u2463\u2467"},{"id":"ref-for-relying-party\u2462\u2463\u2468"}],"title":"13.4.2. Visibility Considerations for Embedded Usage"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u24ea"},{"id":"ref-for-relying-party\u2462\u2464\u2460"}],"title":"13.4.3. Cryptographic Challenges"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u2461"},{"id":"ref-for-relying-party\u2462\u2464\u2462"},{"id":"ref-for-relying-party\u2462\u2464\u2463"},{"id":"ref-for-relying-party\u2462\u2464\u2464"},{"id":"ref-for-relying-party\u2462\u2464\u2465"},{"id":"ref-for-relying-party\u2462\u2464\u2466"},{"id":"ref-for-relying-party\u2462\u2464\u2467"},{"id":"ref-for-relying-party\u2462\u2464\u2468"}],"title":"13.4.4. Attestation Limitations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u24ea"},{"id":"ref-for-relying-party\u2462\u2465\u2460"},{"id":"ref-for-relying-party\u2462\u2465\u2461"}],"title":"13.4.5. Revoked Attestation Certificates"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u2462"},{"id":"ref-for-relying-party\u2462\u2465\u2463"},{"id":"ref-for-relying-party\u2462\u2465\u2464"}],"title":"13.4.6. Credential Loss and Key Mobility"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u2465"},{"id":"ref-for-relying-party\u2462\u2465\u2466"}],"title":"13.4.7. Unprotected account detection"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u2467"},{"id":"ref-for-relying-party\u2462\u2465\u2468"},{"id":"ref-for-relying-party\u2462\u2466\u24ea"},{"id":"ref-for-relying-party\u2462\u2466\u2460"},{"id":"ref-for-relying-party\u2462\u2466\u2461"},{"id":"ref-for-relying-party\u2462\u2466\u2462"},{"id":"ref-for-relying-party\u2462\u2466\u2463"},{"id":"ref-for-relying-party\u2462\u2466\u2464"},{"id":"ref-for-relying-party\u2462\u2466\u2465"}],"title":"13.4.8. Code injection attacks"},{"refs":[{"id":"ref-for-relying-party\u2462\u2466\u2466"},{"id":"ref-for-relying-party\u2462\u2466\u2467"},{"id":"ref-for-relying-party\u2462\u2466\u2468"},{"id":"ref-for-relying-party\u2462\u2467\u24ea"},{"id":"ref-for-relying-party\u2462\u2467\u2460"},{"id":"ref-for-relying-party\u2462\u2467\u2461"},{"id":"ref-for-relying-party\u2462\u2467\u2462"}],"title":"13.4.9. Validating the origin of a credential"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2463"}],"title":"14. Privacy Considerations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2464"},{"id":"ref-for-relying-party\u2462\u2467\u2465"},{"id":"ref-for-relying-party\u2462\u2467\u2466"},{"id":"ref-for-relying-party\u2462\u2467\u2467"},{"id":"ref-for-relying-party\u2462\u2467\u2468"},{"id":"ref-for-relying-party\u2462\u2468\u24ea"},{"id":"ref-for-relying-party\u2462\u2468\u2460"}],"title":"14.1. De-anonymization Prevention Measures"},{"refs":[{"id":"ref-for-relying-party\u2462\u2468\u2461"},{"id":"ref-for-relying-party\u2462\u2468\u2462"},{"id":"ref-for-relying-party\u2462\u2468\u2463"},{"id":"ref-for-relying-party\u2462\u2468\u2464"},{"id":"ref-for-relying-party\u2462\u2468\u2465"},{"id":"ref-for-relying-party\u2462\u2468\u2466"},{"id":"ref-for-relying-party\u2462\u2468\u2467"},{"id":"ref-for-relying-party\u2462\u2468\u2468"},{"id":"ref-for-relying-party\u2463\u24ea\u24ea"},{"id":"ref-for-relying-party\u2463\u24ea\u2460"},{"id":"ref-for-relying-party\u2463\u24ea\u2461"}],"title":"14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials"},{"refs":[{"id":"ref-for-relying-party\u2463\u24ea\u2462"},{"id":"ref-for-relying-party\u2463\u24ea\u2463"},{"id":"ref-for-relying-party\u2463\u24ea\u2464"},{"id":"ref-for-relying-party\u2463\u24ea\u2465"},{"id":"ref-for-relying-party\u2463\u24ea\u2466"}],"title":"14.3. Authenticator-local Biometric Recognition"},{"refs":[{"id":"ref-for-relying-party\u2463\u24ea\u2467"},{"id":"ref-for-relying-party\u2463\u24ea\u2468"},{"id":"ref-for-relying-party\u2463\u2460\u24ea"}],"title":"14.5.1. Registration Ceremony Privacy"},{"refs":[{"id":"ref-for-relying-party\u2463\u2460\u2460"},{"id":"ref-for-relying-party\u2463\u2460\u2461"},{"id":"ref-for-relying-party\u2463\u2460\u2462"},{"id":"ref-for-relying-party\u2463\u2460\u2463"}],"title":"14.5.2. Authentication Ceremony Privacy"},{"refs":[{"id":"ref-for-relying-party\u2463\u2460\u2464"}],"title":"14.6. Privacy considerations for Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2463\u2460\u2465"},{"id":"ref-for-relying-party\u2463\u2460\u2466"}],"title":"14.6.1. User Handle Contents"},{"refs":[{"id":"ref-for-relying-party\u2463\u2460\u2467"},{"id":"ref-for-relying-party\u2463\u2460\u2468"},{"id":"ref-for-relying-party\u2463\u2461\u24ea"},{"id":"ref-for-relying-party\u2463\u2461\u2460"},{"id":"ref-for-relying-party\u2463\u2461\u2461"},{"id":"ref-for-relying-party\u2463\u2461\u2462"},{"id":"ref-for-relying-party\u2463\u2461\u2463"},{"id":"ref-for-relying-party\u2463\u2461\u2464"},{"id":"ref-for-relying-party\u2463\u2461\u2465"},{"id":"ref-for-relying-party\u2463\u2461\u2466"},{"id":"ref-for-relying-party\u2463\u2461\u2467"},{"id":"ref-for-relying-party\u2463\u2461\u2468"}],"title":"14.6.2. Username Enumeration"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u24ea"},{"id":"ref-for-relying-party\u2463\u2462\u2460"},{"id":"ref-for-relying-party\u2463\u2462\u2461"},{"id":"ref-for-relying-party\u2463\u2462\u2462"},{"id":"ref-for-relying-party\u2463\u2462\u2463"}],"title":"14.6.3. 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