The zone files of “.cy”, and the sub-domains “.com.cy”, “ac.cy”, “org.cy” are ‘signed’, i.e. they contain information that allows the use of DNSSEC (DNS Security) technology in order to certify the integrity and correctness of the responses given by domain name servers.
To fully enable the capabilities provided using this technology, domain names should be ‘signed’. The ‘signing’ of domain names is carried out through the Registry and according to the instructions you can find here. Using DNSSEC is optional.