Authenticated denial of existence is a DNSSEC mechanism that provides proof that a domain name or DNS record does not exist.

Without DNSSEC, attackers may be able to forge DNS responses that falsely indicate a valid domain name or service does not exist. DNSSEC uses NSEC or NSEC3 records to provide cryptographic proof that the requested information is genuinely absent.

This helps protect users from DNS spoofing and other attacks that attempt to hide, manipulate, or misrepresent DNS information.