The CESNET association mediates TCS Certificates in the framework of the Trusted Certificate Service project. Currently, Sectigo is the issuer of these certificates. Most of the common internet browsers and e-mail clients trust in its root certificates.

Personal TCS Certificates are intended for e-mail security and network applications authentication.

Server TCS Certificates are intended for WWW and more internet services communicating via secure protocol and proves identity of the server to users.

Robot TCS certificates are similar to the personal ones. They are issued for machine email addresses and they are intended for signing and encryption of email communication between server applications.

Code TCS certificates are intended for signing application code by its developers.

Document TCS certificates are intended for electronic signing of documents.