## Intersection of http://smart.who.int/trust/CodeSystem/WHO.TRUST.KEYUSAGE and http://smart.who.int/trust/CodeSystem/WHO.TRUST.KEYUSAGE

This is the CodeSystem that contains codes in both WHO.TRUST.KEYUSAGE CodeSystem (http://smart.who.int/trust/CodeSystem/WHO.TRUST.KEYUSAGE) and WHO.TRUST.KEYUSAGE CodeSystem (http://smart.who.int/trust/CodeSystem/WHO.TRUST.KEYUSAGE).

### Structure

Generated Narrative: CodeSystem 552891ce-b7b5-42b1-b83a-b8578dbcb50c-9

This code system `http://hl7.org/fhir/comparison/CodeSystem/552891ce-b7b5-42b1-b83a-b8578dbcb50c-9` defines codes, but no codes are represented here

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
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