{"id":57,"date":"2026-09-28T05:06:45","date_gmt":"2026-09-28T05:06:45","guid":{"rendered":"https:\/\/www.tempohosting.co.uk\/blog\/dnssec-explained-how-it-protects-your-domain\/"},"modified":"2026-09-28T05:06:45","modified_gmt":"2026-09-28T05:06:45","slug":"dnssec-explained-how-it-protects-your-domain","status":"publish","type":"post","link":"https:\/\/www.tempohosting.co.uk\/blog\/dnssec-explained-how-it-protects-your-domain\/","title":{"rendered":"DNSSEC Explained: How It Protects Your Domain"},"content":{"rendered":"

DNS translates familiar domain names into the addresses computers use to reach websites and online services. Traditional DNS was designed for availability, not for proving that every answer is authentic. DNS Security Extensions, better known as DNSSEC, add cryptographic signatures that help resolvers detect forged or altered DNS data.<\/p>\n

What DNSSEC actually protects<\/h2>\n

When a DNS zone is signed, its record sets receive digital signatures stored in RRSIG records. A validating recursive resolver checks those signatures before accepting an answer. If the data has been modified or the signature cannot be verified, validation fails instead of silently returning information that may send a visitor to the wrong destination.<\/p>\n

DNSSEC protects the authenticity and integrity of DNS answers. It does not encrypt queries, hide the domain being requested, secure a web server, or replace HTTPS. Those are separate security goals. If you want a refresher on ordinary resolution first, see our guide to what happens after you type a domain name<\/a>.<\/p>\n

How the chain of trust works<\/h2>\n

A signed zone publishes DNSKEY records containing its public keys. The corresponding private keys create signatures for its DNS data. The parent zone publishes a DS record that identifies a trusted key in the child zone. These links continue upward until they reach a trust anchor known to the validating resolver.<\/p>\n

This chain lets the resolver confirm that an answer belongs to the expected zone. DNSSEC also provides authenticated denial of existence, allowing a signed response to prove that a requested name or record type does not exist.<\/p>\n

Why correct deployment matters<\/h2>\n

DNSSEC can improve trust, but a broken chain may make a domain unreachable for users behind validating resolvers. Common causes include publishing an incorrect DS record, removing an active signing key too early, allowing signatures to expire, or changing DNS providers without coordinating the key transition.<\/p>\n

Timing deserves particular attention. DNS records and signatures remain in caches according to their configured lifetimes. Our article on choosing the right DNS TTL<\/a> explains why cached information must be considered before planned changes.<\/p>\n

A practical DNSSEC checklist<\/h2>\n