About SK

SK (Certification Centre, legal name AS Sertifitseerimiskeskus) is Estonia's primary and currently the only certification authority (CA), providing certificates for authentication and digital signing to Estonian ID Cards.

The core function of AS Sertifitseerimiskeskus (SK) is to ensure the reliability and integrity of the electronic infrastructure behind the Estonian ID Card project. We function as a CA, provide certificates to the card and also the services necessary for utilizing the certificates and giving legally binding digital signatures. We also function as a competence center for ID Card and spread the knowledge necessary for creating electronic applications to the card. You can already give legally binding digital signatures in Estonia using applications based on SK-s DigiDoc architecture.

In addition, SK provides certification service within electronic tachograph project in Estonia, Latvia, Lithuania, and Denmark. We are also the partner of Lithuanian mobile operator Omnitel.

Established in February 2001 by two leading Estonian banks Hansapank (member of the Swedbank group) and SEB (member of SEB Group) and two telecom companies, Elion and EMT (members of the TeliaSonera group), SK has the backing of Estonian and Nordic financial and telecom sector. Equity investment of owners stands at EUR 2.56 million, turnover of the company in 2006 totalled ca EUR 2 million.

Watch also the video introducing SK.

SK is currently offering its services, incl. involvement in R&D projects across the Baltics.Our customers include the Estonian court system and notaries, Central Bank and commercial banks, enforcement organisations 

(e.g. Police) and many others.

We are contributing the results of our work on digital signatures to the international digital signature community as an open user group, open source project available at Visit the site to learn more.

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