In this thesis, many efforts have been made for the research on the implementation of open-source DNS, for the purpose of improving its efficiency, as well as intensifying DNS security.

本文致力于研究域名系统的开源实现，力求能从效率及安全性两方面对开源dns服务器做出某些改进。

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Because his servers had long ago added an extra security identifier to their DNS requests, OpenDNS circumvented Kaminsky's hack.

FORBES: No Phishing Zone

Ulevitch's hacker paranoia inspired him to add an extra security feature: All DNS servers tag data with one random number (from 1 to 65, 000) to enable servers to recognize the right piece of data at the right time.

FORBES: No Phishing Zone

It also offers a range of security services, including managed DNS, Distributed Denial of Service (DDoS) mitigation and cyber-threat reporting.

FORBES: VeriSign's Future Looks Stable with .com and.net Registries in the Bag