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Update "What is DNSSEC?" (#1223)

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@ -279,9 +279,17 @@ Encrypted DNS with a 3rd party should only be used to get around redirects and b
[List of recommended DNS servers](../dns.md){ .md-button } [List of recommended DNS servers](../dns.md){ .md-button }
## What is DNSSEC and when is it used? ## What is DNSSEC?
[Domain Name System Security Extensions](https://en.wikipedia.org/wiki/Domain_Name_System_Security_Extensions) (DNSSEC) is used to provide authenticity to the records being fetched from upstream DNS servers. It doesn't provide confidentiality, for that we use one of the [encrypted DNS](#what-is-encrypted-dns) protocols discussed above. [Domain Name System Security Extensions](https://en.wikipedia.org/wiki/Domain_Name_System_Security_Extensions) (DNSSEC) is a feature of DNS that authenticates responses to domain name lookups. It does not provide privacy protections for those lookups, but rather prevents attackers from manipulating or poisoning the responses to DNS requests.
In other words, DNSSEC digitally signs data to help ensure its validity. In order to ensure a secure lookup, the signing occurs at every level in the DNS lookup process. As a result, all answers from DNS can be trusted.
The DNSSEC signing process is similar to someone signing a legal document with a pen; that person signs with a unique signature that no one else can create, and a court expert can look at that signature and verify that the document was signed by that person. These digital signatures ensure that data has not been tampered with.
DNSSEC implements a hierarchical digital signing policy across all layers of DNS. For example, in the case of a `privacyguides.org` lookup, a root DNS server would sign a key for the `.org` nameserver, and the `.org` nameserver would then sign a key for `privacyguides.org`’s authoritative nameserver.
<small>Adapted from [DNS Security Extensions (DNSSEC) overview](https://cloud.google.com/dns/docs/dnssec) by Google and [DNSSEC: An Introduction](https://blog.cloudflare.com/dnssec-an-introduction/) by Cloudflare, both licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).</small>
## What is QNAME minimization? ## What is QNAME minimization?