消息发送方：发送消息的组件。

Message Sender: Component that sends the message.

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类似地，数字签名则是消息发送方使用自己的私钥签署消息。

Similarly, with a digital signature the sender of the message signs the message using his or her own private key.

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身份验证：识别双方(消息发送方和接收方)鉴别批次的方式。

Authentication: is a way for the parties (sender and receiver) to identify each other.

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