| 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 |