What is encrypted DNS? Detailed explanation of the principle and function of encrypted DNS

behind the high-speed operation of the Internet, DNS is like an address book in the online world, responsible for converting easy-to-remember domain names into Internet Protocol Addresses that can be recognized by machines. However, the transmission process of traditional DNS lacks encryption protection, and users' access behavior is easily monitored and tampered with, which brings privacy leakage and cyber security risks. Encrypted DNS, as an upgrade scheme of traditional DNS, is gradually becoming an important issue in the field of cyber security. This article will comprehensively explain the core value and application logic of encrypted DNS from multiple dimensions such as definition, principle, and function.

What exactly is encrypted DNS?

to understand encrypted DNS, we must first start with the pain points of traditional DNS, which can help us more clearly understand the positioning of encrypted DNS.

1 basic definition of encrypted DNS

encrypted DNS is a network technology that encrypts DNS query and response data. It protects the transmission process through encryption protocol on the basis of traditional DNS to avoid data being stolen or tampered with by third parties during network transmission. Unlike the plaintext transmission of traditional DNS, encrypted DNS allows users' domain name resolution requests to be encrypted throughout the process, which solves the privacy and security bugs of traditional DNS from the root cause.

2, the difference between encrypted DNS and traditional DNS

traditional DNS uses UDP protocol for clear text transmission, any node on the transmission path can easily capture the user's domain name query records, and even tamper with the response content to guide the user to visit the phishing website. Encrypted DNS encapsulates data through encryption protocols such as TLS or HTTPS to ensure that only users and designated encrypted DNS servers can resolve the transmitted content, isolating the illegal intervention of third parties from the transmission level.

What is the working principle of encrypted DNS?

the core advantage of encrypted DNS from its special operating mechanism, dismantling its principle can help us understand how it implements security resolution.

1, the core encryption logic of encrypted DNS

the operation of encrypted DNS revolves around the two cores of "encrypted transmission" and "authentication". When a user initiates a domain name resolution request, the encrypted DNS client side will first establish an encrypted connection with the encrypted DNS server. At present, the mainstream encryption methods include DNS over TLS and DNS over HTTPS. After the encrypted connection is established, the user's query request will be encrypted and sent to the server. After the server is processed, the encrypted response will be returned to the user to avoid plaintext data exposure throughout the process.

2, the mainstream implementation of encrypted DNS

there are two widely used implementations of encrypted DNS: one is DNS over TLS, which encapsulates DNS query data in the TLS protocol and uses port 853 for transmission, which can effectively prevent data from being eavesdropped; the other is DNS over HTTPS, which disguises DNS query requests as HTTPS requests and uses port 443 for transmission, which not only realizes encryption, but also bypasses the restrictions on DNS traffic in some network environments. Both solutions have advantages, and users can choose the appropriate encrypted DNS type according to their own network environment.

What are the core functions of encrypted DNS?

the emergence of encrypted DNS is not a technical gimmick, but for the actual needs of cyber security and privacy protection, it can bring multi-dimensional value to users.

1, protect users' online privacy

in the traditional DNS environment, every domain name query of the user is equivalent to leaving a "footprint" on the network, and these records may be obtained by operators, advertisers or hackers for precision marketing or illegal profit. Encrypted DNS encrypts the transmission so that third parties cannot obtain the content of the user's domain name query, thus effectively protecting the privacy of users' network access and preventing the abuse of personal behavior data.

2, improve the security of domain name resolution

encrypted DNS not only prevents query data from being stolen, but also avoids response data being tampered with. Under the authentication mechanism of encrypted DNS, only the response returned by the legitimate encrypted DNS server can be resolved by the client side, and hackers cannot guide users to visit malicious websites by tampering with DNS responses. This greatly reduces the risk of users encountering phishing attacks and malicious software implantation, and improves the overall security of network access.

3, optimize the special network environment experience

in some network environments with DNS hijacking, the resolution results of traditional DNS may be tampered with, resulting in users unable to access the target website normally. The encrypted transmission characteristics of encrypted DNS can bypass most DNS hijacking methods, ensure that users' domain name resolution requests can accurately reach the designated server, obtain real resolution results, and improve access stability in complex network environments.

How to configure the use of encrypted DNS?

understand the value of encrypted DNS, mastering its configuration method can help us quickly implement technology and enjoy more secure network services.

1, encrypted DNS configuration for personal devices

the current mainstream operating systems have supported encrypted DNS, take Windows as an example, users can find the "DNS Encryption" option in the network settings, select "Use encrypted DNS only", and enter the public encrypted DNS server address, such as Cloudflare's 1.1.1.1 or Google's 8.8.8.8. The mobile phone can turn on the encrypted DNS function and fill in the corresponding server address in the advanced settings of WiFi or mobile networks.

2, encrypted DNS configuration at the router level

If you want the entire LAN device to use encrypted DNS, you can replace the default DNS server with the encrypted DNS server address in the DNS settings of the router, and turn on the DNS encryption function of the router. Some high-end routers also support automatic identification of encrypted DNS servers, just turn on the corresponding option to complete the configuration, so that all devices in the LAN can enjoy the protection of encrypted DNS without setting it up separately.

sum up, encrypted DNS as a traditional DNS security upgrade program, through encrypted transmission to solve the traditional DNS privacy leakage and data tampering problems, its core principle around the encryption protocol and authentication, can provide users with privacy protection, security analysis and stable access and other multiple values. Whether it is a personal device or a local area network environment, can open the encrypted DNS service through simple configuration, in the daily network access to build a secure line of defense.