DNSSEC: Everything you need to know

The concept of DNSSEC

The collection of security extensions known as DNSSEC gives DNS authentication and data integrity.

The Internet Engineering Task Force (IETF) developed it in the 1990s. Its principal objective is to offer an authentication mechanism that uses digital signatures based on open cryptography to demonstrate the data’s origin. With a private key, the data owner can certify the security of DNS data (DNS records). Each recursive server can authenticate the source of the data by comparing it to the public key.

The root server is at the top of the trust chain, which extends down to the specific hostname. Except for the root zone, which has nothing above it, each zone is signed by the one above it.

The recursive server will drop data and try again if, for any reason, it cannot authenticate it. Be safe rather than sorry.

How does DNSSEC increase security?

Your security is increased by DNSSEC, which gives you the instruments (suite) to ensure that DNS records are not changed. As a result, your safety is boosted, and the likelihood of illicit activities like DNS cache poisoning is reduced (DNS spoofing). When a criminal is able to change DNS records instantly, the client receives them and is then directed to a different server that the criminal is in control of.

Additionally, DNSSEC enables you to verify the origin of DNS data. You should be aware by now of the frequency and various methods thieves employ to attack the DNS. This feature for authentication is very important. Knowing for sure that data truly belongs to the source they are said to come from, i.e., to the correct authoritative name server, is priceless. This lessens the likelihood of bogus servers succeeding.

If DNSSEC is enabled, DNS recursive servers can verify the authenticity of the data they use, making it trustworthy. We will discard fake data. And they won’t use them to maintain security if the recursion somehow fails to authenticate data. In order to prevent the use of phony or fabricated data, they will attempt the authentication procedure again.

How to apply it?

Most DNS hosting firms support DNSSEC, but it is not turned on by default. As a result, almost all well-known generic top-level domains and country-code top-level domains can use DNSSEC, although some domains cannot.

You must activate it in the management panel (Dashboard) of your DNS provider before you can begin using it. Then, simply select “enable” next to each zone you desire. After that, you’ll get a DS record (delegation singer) and put it in the location where your domain is registered. The chain will then be finished.


Priority one is security. Your domain cannot exist online without DNS, however, DNS by itself is not secure. To safeguard your domain, network, and users, enable DNSSEC.

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3 DNS attacks you should know

Definition of DNS attacks

What is the definition of DNS attacks? The term refers to a type of cyber attack in which malicious hackers target an organization’s DNS servers, which hold domain names that the hackers seek. They can then carry out the assaults listed below once they obtain those domain names. In addition, bad actors can potentially check for vulnerabilities in a system to exploit.

Any attack against the availability or stability of a network’s DNS service is referred to as a DNS attack. DNS assaults include cache poisoning and other attacks that use DNS as a method as part of a larger attack strategy.

3 prevalent DNS attacks that you need to know

  1. DNS poisoning

A DNS poisoning, commonly known as DNS cache poisoning or DNS spoofing attack, ruins the DNS server by replacing the original IP address with a fraudulent one stored in the server’s cache memory. Attackers employ this approach to divert web traffic to a hacker-controlled website where sensitive data is harvested. Furthermore, these malicious websites are frequently used to infect end users’ computers with viruses or worms, giving the threat actor long-term access to the machine and any data it saves.

  1. Amplification attack

An amplification attack is any attack in which the attacker can multiply their power by using an amplification factor. Amplification attacks are “asymmetric.” What does this mean? This is when an attacker only needs a small number of low levels of resources to cause a much larger number or higher level of target resources to malfunction or fail. Some of the most widespread amplification attacks are, for example, Fraggle Attacks (UDP amplification), Smurf Attacks (ICMP amplification), and DNS Amplification.

  1. DNS tunneling

DNS Tunneling is the last major DNS attack. It uses DNS to encrypt (tunnel) malware and other data in DNS requests and responses (client-server way).

In a nutshell, here is how it works. First, a criminal registers a domain and links it to its own name server. In this final phase, a tunneling trojan is installed. A machine that has been infected makes a request to a DNS resolution server. DNS requests can freely get through firewalls because DNS is authorized. Here is when the risk begins. The resolver forwards the request to the criminal’s server, which establishes a link between the criminal and the target via the DNS resolution server. Because there is no direct link between the target and the criminal, the criminal’s computer is hidden and difficult to detect.

Is it possible to be protected?

You now realize how dangerous DNS hacks may be. Here are some strategies for dealing with them:

  • Implement DNSSEC. DNSSEC (Domain Name System Security Extensions) is a DNS security extension. It gives DNS data that travels the internet with cryptographic verification, validating the source and integrity of the DNS data.
  • Use Monitoring service. Monitoring outgoing and inbound queries is the first step in discovering abnormalities. Furthermore, the context information offered by your answer data allows for a more thorough forensic investigation.
  • Install a firewall. A firewall is a network security solution (hardware, software, or both) that protects networks by utilizing certain functionality and security rules. Incoming and outgoing traffic monitoring, traffic filtering, unauthorized outsider access blocking, suspicious traffic blocking, and dangerous program blocking are just some of the features available.


You are now familiar with the most popular DNS attacks – DNS poisoning, Amplification attack, and DNS tunneling. So, if you want to protect yourself against them, you could implement DNSSEC, Install a firewall or use a Monitoring service for your traffic.

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