Pursuant to Article 13 of the Security and Intelligence System Act of the Republic of Croatia, the Information Systems Security Bureau (ZSIS) is the central state authority responsible for the technical areas of information security of the state bodies.
 
ZSIS is competent for security of information systems and networks of the state bodies, for managing crypto materials used in the exchange of classified information between the state bodies and foreign countries and organizations, and for coordination of prevention and removal of incidents related to computer networks security of the state bodies.  
 
With the appointment of Director in June 2007, ZSIS has started its work. Pursuant to Article 18 of the Information Security Act of the Republic of Croatia, ZSIS’s principle responsibility is to regulate standards for technical areas of information systems security with ordinances which will apply to all state bodies, local and regional self-government bodies, legal person with public authorities who, within their scope of work, use classified and unclassified information, as well as to legal and natural persons who gain access to or handle classified data.
 
Apart from adopting the above-mentioned ordinances, ZSIS’s responsibility is also to adjust standards for technical areas of information systems security of the Republic of Croatia with the international standards and recommendations, as well as to permanently participate in the national standardization of areas of information systems security.
 
ZSIS is also the National Communication Security Authority (NCSA), the Security Accreditation Authority (SAA), and the National Distribution Authority (NDA).