DNSSEC Explained: How It Works and What to Look For
DNSSEC adds cryptographic authentication to DNS data.
Published by Protocol Explorer · Reviewed
How DNSSEC works
Authoritative zones publish signatures and DNSKEY records. A validating resolver checks signatures and follows a chain of trust anchored in a trusted key.
What to look for in an exchange
RRSIG signatures and DS records serve different roles. DNSSEC verifies authenticity and integrity; it does not encrypt DNS queries or answers.
Follow an example step by step
- Identify the requested DNS records and the associated RRSIG signature.
- Find the DNSKEY used for validation and the DS relationship linking a child zone to its parent.
- Follow the chain toward a configured trust anchor and distinguish validation failure from an unsigned zone.
Common interpretation mistake
DNSSEC adds authenticity and integrity to signed DNS data, not confidentiality.
Key point to remember
A resolver must validate the chain for DNSSEC to provide its intended assurance.
Explore the protocol
The DNSSEC overview is free without an account. Its full interactive lesson is included in Protocol Explorer Pro, a one-time $4.99 purchase; an account is required to buy Pro and restore the licence across devices.
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Specification
Read the primary specification for DNSSEC for the authoritative protocol details. The interactive scenario is a simplified teaching model, not a capture of your network.
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