X.509 is a standard that defines the electronic certificate record format.
X.509 certificates are used in various protocols, such as HTTPS/TLS, electronic signatures, time stamps, etc. The X.509 certificate contains the public key and information about the identity of the owner (computer name, name of organization or individual) and signed that it is authority (CA) or has a self-signed signature. When a certificate is signed by an authorized authority, it can be used for advanced electronic signature X.509 also defines a Certificate Revocation List (CRL) format).
| 01 | Interoperability level | E-Services |
| 02 | Interoperability sublevel | E-services Data presentation and exchange File type and document formats Message transport and security File and message transfer protocols |
| 03 | Interoperability type | - |
| 04 | Institution | CENTRAL STATE OFFICE FOR DEVELOPMENT OF DIGITAL SOCIETY |
| 05 | Language | ENGL |
| 06 | Country | HRV |
| 07 | Authors of the document | ISO / ITU-T |
| 08 | Restrictions on use | - |
| 09 | Compliance with EU funds | Digital certificates represent the basis of the security of e-services. |