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文章就ＩＰＳｅｃ 提供的、与网络层ＶＰＮ 技术密切相关的协议隧道封装、用户信息加密、用户认证等关键技术及与之相关的系统管理等方面的技术细节进行分析，并就利用ＩＰＳｅｃ 技术实现ＶＰＮ的具体方式进行了归纳。
The article analyzes the technical details of the key technologies such as protocol tunnel encapsulation, user information encryption, user authentication and other related system management provided by IPSec, which are closely related to the network layer VPN technology, and also analyzes the technical details of using IPSec technology to implement VPN Specific ways were summarized.