![]() ![]() It only adds a header with a constant sequence followed by routing information (server IP+port) to unmodified DNSCrypt queries. So the only IP address is knows about is the one of the relay, making it impossible to map queries to clientsĪnonymized DNS can be implemented on top of all existing encrypted protocols, but DNSCrypt is by far the simplest and most efficient instantiation. The DNS server itself receives a connection from the relay, not from the actual client. It can only blindly forward the query to the actual DNS server, the only server that can decrypt it. The relay doesn't know the secret key, and cannot learn anything about the content of the query. Instead of directly reaching a server, an Anonymized DNS client encrypts the query for the final server, but sends it to a relay. However, this is slow and unreliable as these mechanisms were not designed to relay DNS traffic.Īnonymized DNS prevents servers from learning anything about client IP addresses, by using intermediate relays dedicated to forwarding encrypted DNS data. In order to prevent this, using DNS over Tor or over proxies (HTTP, SOCKS) has become quite common. They obviously see the decrypted traffic, but also client IP addresses. However, one still has to trust non-logging DNS servers for actually doing what they pretend to do. DNS encryption was a huge step towards making DNS more secure, preventing intermediaries from recording and tampering with DNS traffic.
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