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本文在对域名系统的原理作简要阐述的基础上，分析了当前域名系统中存在的安全隐患，并介绍了 最新的ＩＥＴＦ对域名系统的安全扩展及其实现机制。
Based on a brief exposition of the principle of domain name system, this paper analyzes the security risks existing in the current domain name system and introduces the latest IETF security extension of the domain name system and its implementation mechanism.