The Science of Internet DNS Over HTTPS (DoH): Enhancing Privacy on the Web

Internet privacy just got a major upgrade with the growing adoption of DNS over HTTPS (DoH), a new protocol that encrypts domain name system (DNS) queries.

Traditionally, when users type a website address into their browser, that request passes through a DNS resolver to translate the address into an IP address. This process has often occurred in plain text, meaning anyone with access to network data could see which websites users are visiting. DoH changes this by wrapping DNS queries inside HTTPS (Hypertext Transfer Protocol Secure) connections—encrypting them end-to-end.

The shift to DoH helps protect users from ISPs (Internet Service Providers), advertisers, and malicious actors who might monitor or manipulate DNS traffic. It also improves connection speeds and reliability by leveraging the same secure channels already used for web browsing.

“DoH represents a significant leap forward for user privacy online,” says Dr. Lena Torres from the Institute for Internet Security and Trust. “By encrypting DNS lookups, we reduce the ability of third parties to track user behavior at scale.”

The implementation of DoH is still evolving. Major browsers like Firefox and Chrome now support it, and several ISPs and public DNS services offer DoH-enabled resolutions. However, the transition isn’t without controversy. Some critics argue that DoH could centralize control over DNS, potentially giving large tech companies more influence over internet navigation.

“While DoH enhances privacy, we must remain vigilant about how it’s deployed and governed,” says Dr. Raj Patel, a researcher at the Open Internet Foundation. “Transparency and user choice are essential to ensure DoH benefits everyone equally.”

Despite these concerns, experts agree that DoH is a critical tool in the broader effort to safeguard online privacy. As more users and organizations adopt it, the hope is that we’ll see a web where browsing habits remain private by default.

The future of internet privacy may well depend on protocols like DoH becoming standard, offering users stronger protections against unwanted surveillance.