DNS is one of the fundamental technologies of the internet. It connects familiar domain names to server IP addresses. When a user opens a website, their device queries DNS to find out which server the request should be sent to.
But how can you make sure that the response is genuine and has not been tampered with?
This is where DNSSEC (Domain Name System Security Extensions) comes in — a set of DNS extensions that allows DNS responses to be authenticated using digital signatures.
How DNSSEC works
Standard DNS primarily answers the question: "Which IP address corresponds to this domain?"
DNSSEC adds a second question: "Can this response be trusted?"
DNS records are signed using cryptographic keys. When a response is received, a DNSSEC-enabled system can verify the signature and confirm that the data was published by the domain owner or their DNS provider and has not been altered in transit.
If verification fails, the DNS response is considered invalid and may be rejected.
In this way, DNSSEC helps protect against attacks that attempt to redirect users to another server by providing forged DNS responses.
What does DNSSEC protect against?
The primary purpose of DNSSEC is to protect against DNS data tampering.
For example, an attacker might try to make a user receive the IP address of a different server instead of the real address for example.com. That server could host a fake page designed to steal usernames, passwords, or other data.
DNSSEC allows the system to verify that the received DNS record matches the published and signed version.
This is particularly important for:
- corporate websites;
- online stores;
- banking and financial services;
- email domains;
- authentication services;
- domains used for critical online services.
DNSSEC does not replace an SSL certificate
DNSSEC and HTTPS solve different problems.
DNSSEC protects the integrity of DNS data, while HTTPS encrypts the connection between a user's browser and a website and helps verify the website's authenticity using a TLS certificate.
Therefore, DNSSEC is not an alternative to an SSL certificate. These technologies complement each other.
You can think of it this way:
DNSSEC → the correct IP address
HTTPS → a secure connection to the website
Both layers of protection are beneficial for a modern website.
Should you enable DNSSEC for your domain?
If your domain zone and DNS provider support DNSSEC, enabling it is a good security practice.
DNSSEC does not require any changes to your website's code. Signing takes place at the DNS infrastructure level, and website visitors do not need to install any additional software.
The key is to configure DNSSEC correctly and make sure the domain's chain of trust is working properly.
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What is the DNSSEC chain of trust?
DNSSEC uses a hierarchical trust system.
A special DS (Delegation Signer) record is created for the domain to link it to a DNSSEC cryptographic key. This allows the validating resolver to verify the authenticity of DNS data step by step.
That is why, when transferring a domain between registrars or changing DNS providers, it is important to migrate the DNSSEC settings correctly as well. An error in the chain of trust can prevent the domain from resolving properly for users whose DNS resolvers perform DNSSEC validation.
DNSSEC and website infrastructure
Website security consists of several layers. DNSSEC protects one of them — the transmission and validation of DNS data. HTTPS secures the connection, while the server infrastructure ensures the website itself remains available and runs reliably.
Therefore, when launching a new project, it makes sense to plan not only the registration of a domain, but also its hosting, SSL certificate, backups, and other infrastructure components.
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Conclusion
DNSSEC provides an additional layer of protection against DNS record tampering.
It does not protect a website against every type of attack and does not replace HTTPS, but it helps ensure that a DNS response matches the published data.
If a domain is used for a business, online store, corporate email, or another important service, DNSSEC is worth considering as one of the fundamental security measures for your domain infrastructure.
