Encrypted DNS refers to the practice of securing Domain Name System (DNS) queries and responses through cryptographic protocols. Traditional DNS operates in plaintext, meaning that DNS lookups—which translate domain names into IP addresses—are visible to network administrators, Internet service providers, and potentially other parties with network access. Encrypted DNS protects this information by preventing unauthorized observation of which websites a user visits.
Implementation Methods
The primary protocols enabling encrypted DNS are DNS over HTTPS (DoH) and DNS over TLS (DoT). DoH encapsulates DNS queries within standard HTTPS traffic, allowing queries to blend with regular web traffic. DoT establishes a dedicated encrypted channel using Transport Layer Security (TLS) on port 853. Both methods use public-key cryptography to establish secure connections between clients and DNS resolvers. A newer approach, DNS over QUIC (DoQ), applies similar encryption principles using the QUIC transport protocol.
Practical Considerations
Encrypted DNS improves privacy by hiding query content from network observers, but it does not conceal the fact that a DNS lookup occurred. The resolver receiving the query still knows which domains are being requested unless additional privacy measures are implemented. Adoption has grown among privacy-conscious users and organizations, though widespread deployment faces challenges including performance overhead and compatibility with existing network infrastructure.
Source Notes
- 2026-04-17: Lattice Cryptography A Post Quantum Solution for Data Security · ▶ source
- 2026-04-30: Post-Quantum Cryptography · ▶ source