信任方：只为这个域创建了信任。

Sides of trust: Created the trust for this domain only.

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从本质上说，它们是受信任方发布的电子id卡。

They are, in essence, electronic ID CARDS issued by trusted parties.

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当收到加密的消息时，受信任方使用其私钥解密会话密钥，然后使用它解密消息。

When receiving the encrypted message, the trusted party USES its private key to decrypt the session key and then USES it to decrypt the message.

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