KeyUsage
type: CodeSystem
node role: treeRoot
id:
  v: KeyUsage
text:
  status:
    v: generated
  div:
    v: Generated Narrative: CodeSystem KeyUsage This case-insensitive code system http://smart.who.int/trust/CodeSystem/KeyUsage defines the following codes: Code Display Definition SCA Signer Certificate Authority (SCA) A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant DSC Document Signing Certificate (DSC) A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate DECA Data Exchange Certificate Authority (DECA) A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant DESC Data Exchange Signing Certificate (DESC) A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants TLS Transport Layer Security (TLS) Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant UP Upload (UP) 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
url:
  v: http://smart.who.int/trust/CodeSystem/KeyUsage
version:
  v: 1.7.1
name:
  v: KeyUsage
title:
  v: WHO GDHCN Key Usage CodeSystem
status:
  v: active
experimental:
  v: true
date:
  v: 2026-08-27T05:23:17+00:00
publisher:
  v: WHO
contact:
  name:
    v: WHO
  telecom:
    system:
      v: url
    value:
      v: http://who.int
description:
  v: 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
jurisdiction:
  coding:
    system:
      v: http://unstats.un.org/unsd/methods/m49/m49.htm
    code:
      v: 001
case sensitive:
  v: false
content:
  v: complete
count:
  v: 6
concept:
  code:
    v: SCA
  display:
    v: Signer Certificate Authority (SCA)
  definition:
    v: A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant
concept:
  code:
    v: DSC
  display:
    v: Document Signing Certificate (DSC)
  definition:
    v: A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate
concept:
  code:
    v: DECA
  display:
    v: Data Exchange Certificate Authority (DECA)
  definition:
    v: A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant
concept:
  code:
    v: DESC
  display:
    v: Data Exchange Signing Certificate (DESC)
  definition:
    v: A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants
concept:
  code:
    v: TLS
  display:
    v: Transport Layer Security (TLS)
  definition:
    v: Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant
concept:
  code:
    v: UP
  display:
    v: Upload (UP)
  definition:
    v: 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