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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