什么是DNSSEC？

DNSSEC是域名系统（DNS）的一项功能，用于验证对域名查找的响应。它可以防止攻击者操纵或毒害对DNS请求的响应。DNS技术的设计没有考虑到安全性。对DNS基础架构的攻击的一个示例是DNS欺骗。在这种情况下，攻击者会劫持DNS解析程序的缓存，导致访问网站的用户接收到错误的IP地址，并查看攻击者的恶意站点，而不是他们想要的站点。

DNSSEC是如何工作的

当您激活DNSSEC时，我们将为您的区域生成公钥和私钥。公钥以DS或DNSKEY记录的形式提供给您。应在注册域名的域提供商处配置记录。在我们的网络中部署您的区域期间，我们将使用私钥对您的所有记录进行签名。如果这些签名与公钥匹配，最终用户解析程序将接收并检查这些签名，并且解析程序将能够验证这些记录在网络传输期间未被操纵。

The main purpose of DNSSEC is to keep the users safe. That happens after the user types the domain name in the browser and the resolver verifies the digital signature. Only when the digital signatures in the data and those in the Primary DNS server match the information can reach the user's device. That way, it guarantees that the user is connecting with the legitimate website. DNSSEC implements a combination of digital signatures and public keys to validate the information, and it adds new records to the existing DNS records. DNSKEY and RRSIG digitally "sign" the DNS data using a public-key cryptography technique. They stick to the other popular records, like A, CNAME, and MX.

The name server holds the public and private keys for each DNS zone. So, when a user makes a query, the server provides the information signed with its private key. Then the recipient has to open it with the public key. That way, if the information is modified and misleading, it won't open correctly with the public key. As a result, the recipient is going to receive an error message.