Engineers at Cloudflare and Apple say they’ve developed a new internet protocol that will shore up one of the biggest holes in internet privacy that many don’t know even exists. Dubbed Oblivious DNS-over-HTTPS, or ODoH for short, the new protocol makes it far more difficult for internet providers to know which websites you visit.

But first, a little bit about how the internet works.

Every time you go to visit a website, your browser uses a DNS resolver to convert web addresses to machine-readable IP addresses to locate where a web page is located on the internet. But this process is not encrypted, meaning that every time you load a website the DNS query is sent in the clear. That means the DNS resolver — which might be your internet provider unless you’ve changed it — knows which websites you visit. That’s not great for your privacy, especially since your internet provider can also sell your browsing history to advertisers.

Recent developments like DNS-over-HTTPS (or DoH) have added encryption to DNS queries, making it harder for attackers to hijack DNS queries and point victims to malicious websites instead of the real website you wanted to visit. But that still doesn’t stop the DNS resolvers from seeing which website you’re trying to visit.

Enter ODoH, which builds on previous work by Princeton academics. In simple terms, ODoH decouples DNS queries from the internet user, preventing the DNS resolver from knowing which sites you visit.

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