All public SSL/TLS certificates for orthanc.ca and its sub-domains are signed by our own root certificate authority.
If you want to trust our certificates you need to import the public key for our root signing authority into your SSL-aware software. For many web browsers, navigating to the HTTP link below will automatically start the import process. For other software you will have to consult its documentation.
Note that we provide several independent methods for retrieving the certificates. You should use at least two of them, and verify that all the certificates match before importing them.