CERTUM – Certification Authority was set up on December 15, 1998 as an organizational unit of Unizeto Technologies SA to provide certification services related to electronic signature. It is the oldest and the largest public certification authority in Poland, operating on a worldwide scale – rendering services to clients from several dozen countries. The company is located in Szczecin, in the Unizeto Services Center, a modern special facility providing CERTUM infrastructure and systems with a uniquely high level of electronic, mechanical and access security, as well as business continuity. The CERTUM systems that require special protection are located in special security zones, e.g. a sample generator for cryptographic keys is placed in the electromagnetic/tempest-proof chamber, ensuring the security of sensitive data, and protecting them against secondary emissions.