... pianyi handle_in ;将指针移到文件头 call decry ;执行解密 fwrite handle_in,buffer,readsize ;写解密数据 ...
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在这种情况下，即使侦测成功，也必须执行解密操作。
In this case, if detection is successful, decryption must also be performed.
在将消息转发给接收方之前，Facade在其上执行解密、授权和身份验证。
Before the message is forwarded to the receiver, Facade performs decryption, authorization and authentication on it.
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.
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