加密服务提供者。
加密可以保证有关某个主题的数据机密性，原因是只有拥有正确私钥的服务提供者才能正确执行解密，因此也能读懂该数据。
The encryption guarantees the data confidentiality on the topic, because only the service provider owning the right private key can perform decryption correctly and, thus, understand the data.
ESB 和提供者服务之间的链路可能由网络体系结构、ESB 凭据或使用 PKI 的加密进行保护。
The link between the ESB and provider services may be secured by network architecture, by ESB credentials or by encryption using PKI.
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