Remove CL Signature example (#1305)

w3c · Oct 13, 2023 · 5536809 · 5536809
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diff --git a/common.js b/common.js
@@ -55,16 +55,6 @@ var vcwg = {
       status: "CG-DRAFT",
       publisher: "Credentials Community Group"
     },
-    "CL-SIGNATURES": {
-      title: "A Signature Scheme with Efficient Protocols",
-      href: "https://www.researchgate.net/publication/220922101_A_Signature_Scheme_with_Efficient_Protocols",
-      authors: [
-        "Jan Camenisch",
-        "Anna Lysyanskaya"
-      ],
-      status: "Peer Reviewed Paper",
-      publisher: "IBM Research"
-    },
     // aliases to known references
     "HTTP-SIGNATURES": {
       aliasOf: "http-signatures"

diff --git a/index.html b/index.html
@@ -598,9 +598,6 @@ <h3>Use Cases and Requirements</h3>
           <li>
 Securing Verifiable Credentials using Data Integrity Proofs [[VC-DATA-INTEGRITY]].
           </li>
-          <li>
-Camenisch-Lysyanskaya Zero-Knowledge Proofs [[?CL-SIGNATURES]].
-          </li>
         </ul>
 
         <p>
@@ -3508,68 +3505,11 @@ <h3>Zero-Knowledge Proofs</h3>
 The examples below highlight how the data model might be used to issue and
 present <a>verifiable credentials</a> in zero-knowledge.
         </p>
-        <p class="note">
-The provided examples will either be significantly re-written to demonstrate how
-to secure a <a>verifiable credential</a> using a normatively defined method that
-enable zero knowledge proofs, or they will be removed.
-        </p>
-        <p>
-The following example shows one method of using <a>verifiable credentials</a> in
-zero-knowledge. It makes use of a Camenisch-Lysyanskaya Signature
-[[?CL-SIGNATURES]], which allows the presentation of the <a>verifiable
-credential</a> in a way that supports the privacy of the
-<a>holder</a> and <a>subject</a> through the use of selective disclosure of the
-<a>verifiable credential</a> values. Some other cryptographic systems which rely
-upon zero-knowledge proofs to selectively disclose attributes can be found in the
-Verifiable Credential Specifications Directory [[?VC-SPECS]] as well.
-        </p>
-
-        <pre class="example nohighlight" title="A verifiable credential that supports CL Signatures">
-{
-  "@context": [
-    "https://www.w3.org/ns/credentials/v2",
-    "https://www.w3.org/ns/credentials/examples/v2"
-  ],
-  "type": ["VerifiableCredential", "ExampleDegreeCredential"],
-  <span class="highlight">"credentialSchema": {
-    "id": "did:example:cdf:35LB7w9ueWbagPL94T9bMLtyXDj9pX5o",
-    "type": "did:example:schema:22KpkXgecryx9k7N6XN1QoN3gXwBkSU8SfyyYQG"
-  }</span>,
-  "issuer": "did:example:Wz4eUg7SetGfaUVCn8U9d62oDYrUJLuUtcy619",
-  "credentialSubject": {
-    "givenName": "Jane",
-    "familyName": "Doe",
-    "degree": {
-      "type": "ExampleBachelorDegree",
-      "name": "Bachelor of Science and Arts",
-      "college": "College of Engineering"
-    }
-  },
-  <span class="highlight">"proof": {
-    "type": "CLSignature2019",
-    "issuerData": "5NQ4TgzNfSQxoLzf2d5AV3JNiCdMaTgm...BXiX5UggB381QU7ZCgqWivUmy4D",
-    "attributes": "pPYmqDvwwWBDPNykXVrBtKdsJDeZUGFA...tTERiLqsZ5oxCoCSodPQaggkDJy",
-    "signature": "8eGWSiTiWtEA8WnBwX4T259STpxpRKuk...kpFnikqqSP3GMW7mVxC4chxFhVs",
-    "signatureCorrectnessProof": "SNQbW3u1QV5q89qhxA1xyVqFa6jCrKwv...dsRypyuGGK3RhhBUvH1tPEL8orH"
-  }</span>
-}
-        </pre>
-        <p>
-The example above provides the <a>verifiable credential</a> definition by using
-the <code>credentialSchema</code> <a>property</a> and a specific proof that is
-usable in the Camenisch-Lysyanskaya Zero-Knowledge Proof system.
-        </p>
-
-        <p>
-The next example utilizes the <a>verifiable credential</a> above to generate a
-new derived <a>verifiable credential</a> with a privacy-preserving proof. The
-derived <a>verifiable credential</a> is then placed in a
-<a>verifiable presentation</a>, so that the <a>verifiable credential</a>
-discloses only the <a>claims</a> and additional credential metadata that the
-<a>holder</a> intended. To do this, all of the following requirements are
-expected to be met:
+        <p class="issue">
+Examples of leveraging <a href="https://w3c.github.io/vc-di-bbs/">vc-di-bbs</a>,
+will be added here in the future, or this section will be removed.
         </p>
-
+        
         <ul>
           <li>
 Each derived <a>verifiable credential</a> within a <a>verifiable
@@ -3591,41 +3531,6 @@ <h3>Zero-Knowledge Proofs</h3>
           </li>
         </ul>
 
-        <pre class="example nohighlight" title="A verifiable presentation that supports CL Signatures">
-{
-  "@context": [
-    "https://www.w3.org/ns/credentials/v2",
-    "https://www.w3.org/ns/credentials/examples/v2"
-  ],
-  "type": "VerifiablePresentation",
-  "verifiableCredential": [
-    {
-      "@context": [
-        "https://www.w3.org/ns/credentials/v2",
-        "https://www.w3.org/ns/credentials/examples/v2"
-      ],
-      "type": ["VerifiableCredential", "ExampleDegreeCredential"],
-      <span class="highlight">"credentialSchema": {
-        "id": "did:example:cdf:35LB7w9ueWbagPL94T9bMLtyXDj9pX5o",
-        "type": "did:example:schema:22KpkXgecryx9k7N6XN1QoN3gXwBkSU8SfyyYQG"
-      }</span>,
-      "issuer": "did:example:Wz4eUg7SetGfaUVCn8U9d62oDYrUJLuUtcy619",
-      "credentialSubject": {
-        "degreeType": "ExampleBachelorDegree",
-        "degreeSchool": "College of Engineering"
-      },
-      <span class="highlight">"proof": {
-        "type": "AnonCredDerivedCredentialv1",
-        "primaryProof": "cg7wLNSi48K5qNyAVMwdYqVHSMv1Ur8i...Fg2ZvWF6zGvcSAsym2sgSk737",
-        "nonRevocationProof": "mu6fg24MfJPU1HvSXsf3ybzKARib4WxG...RSce53M6UwQCxYshCuS3d2h"
-      }</span>
-  }],
-  <span class="highlight">"proof": {
-    "type": "AnonCredPresentationProofv1",
-    "proofValue": "DgYdYMUYHURJLD7xdnWRinqWCEY5u5fK...j915Lt3hMzLHoPiPQ9sSVfRrs1D"
-  }</span>
-}
-        </pre>
         <figure>
           <img style="margin: auto; display: block; width: 75%;"
             src="diagrams/zkp-cred-pres.svg" alt="Verifiable
@@ -3662,14 +3567,6 @@ <h3>Zero-Knowledge Proofs</h3>
           </figcaption>
         </figure>
 
-        <p class="note">
-Important details regarding the format for the <a>credential</a> definition and
-of the proofs are omitted on purpose because they are outside of the scope of
-this document. The purpose of this section is to guide implementers who want to
-extend <a>verifiable credentials</a> and <a>verifiable presentations</a> to
-support zero-knowledge proof systems.
-        </p>
-
       </section>
 
       <section class="informative">