{
  "description": "CodeSystem for GDHCN Key Usage that has usage codes for verification keys published to the Trust Network as defined by the [certificate governance](concepts_certificate_governance.html) for Production environment",
  "_filename": "CodeSystem-KeyUsage.json",
  "package_name": "smart.who.int.trust",
  "date": "2026-04-27T07:28:36+00:00",
  "publisher": "WHO",
  "jurisdiction": [ {
    "coding": [ {
      "code": "001",
      "system": "http://unstats.un.org/unsd/methods/m49/m49.htm"
    } ]
  } ],
  "content": "complete",
  "name": "KeyUsage",
  "type": null,
  "experimental": "true",
  "resourceType": "CodeSystem",
  "title": "WHO GDHCN Key Usage CodeSystem",
  "package_version": "1.5.0",
  "status": "active",
  "id": "5954db31-a80a-4747-bcd0-6a7f83835162",
  "kind": null,
  "count": 6,
  "url": "http://smart.who.int/trust/CodeSystem/KeyUsage",
  "concept": [ {
    "code": "SCA",
    "display": "Signer Certificate Authority (SCA)",
    "definition": "A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant"
  }, {
    "code": "DSC",
    "display": "Document Signing Certificate (DSC)",
    "definition": "A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate"
  }, {
    "code": "DECA",
    "display": "Data Exchange Certificate Authority (DECA)",
    "definition": "A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant"
  }, {
    "code": "DESC",
    "display": "Data Exchange Signing Certificate (DESC)",
    "definition": "A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants"
  }, {
    "code": "TLS",
    "display": "Transport Layer Security (TLS)",
    "definition": "Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant"
  }, {
    "code": "UP",
    "display": "Upload (UP)",
    "definition": "Used to verify digital signature of cryptographically signed content uploaded to services within the Global Digital Health Certification Network, in particular the Trust Network Gateway"
  } ],
  "caseSensitive": false,
  "version": "1.5.0",
  "contact": [ {
    "name": "WHO",
    "telecom": [ {
      "value": "http://who.int",
      "system": "url"
    } ]
  } ]
}