一天，杨在旅途中遇到了其旧同僚王密。

One day, Yang met his old workmate Wang Mi on a trip.

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服务器接接收加密交换密匙并使用其私有密匙进行解密。

The server receives the encrypted exchange key and decrypts it with its private key.

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可信的第三方通过使用其自己的签名发出证书，为公开密匙和识别信息做证明。

The trusted third party vouches for the public key and identifying information by issuing the certificate with its signature.

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