The two approaches effectively balanced the overhead of IPsec VPN gateway, speeded up the authentication process and improved the timeliness of CRLs a lot.

这两种方案能有效平衡网关开销、提高认证速度并能较大提高有效CRL的及时性。

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Some form of network-level encryption, such as a Virtual Private Network (VPN), perhaps using IP Security Protocol (IPSEC), is the most obvious solution, although there are other reasonable choices.

某种可能使用 IP 安全性协议 (IPSEC) 的网络级加密形式（例如虚拟专用网 (VPN)）是最可取的解决方案，虽然也有其他合理的选择。

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This paper is mainly on the subject how to consider efficiency and security of transport as a whole, and presents a VPN scheme including the advantages of IPSEC and MPLS.

本文主要研究VPN的传输效率与安全性如何两者兼顾的问题，在IPSEC和MPLS之间提出了一种各取所长的VPN解决方案。

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