如果他的公钥可以成功地解密该计划，则您就能知道计划是由他发送的。

If his public key successfully decrypted it, you know the plans came from him.

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如果您的公钥能够解密条目，则使用您的私钥对它签名。

If your public key can decrypt the entry, then your private key was used to sign it.

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如果安全策略要求，则对请求进行解密。

Decrypt the request if the security policies dictate it.

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