通过这种方式可以极大地提高性能，并且可以防止用明文传输用户ID和密码，进而防止未授权的用户访问数据。

In this way, you can greatly improve performance and still prevent transmission of user IDs and passwords in clear text, thus preventing unauthorized access to the data.

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这一语法说明密码已加密，不会以明文方式出现在配置文件中。

This syntax means that the password has been encoded to prevent it from being exposed in plaintext in the configuration file.

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以明文方式传输消息、传输加密的但以明文方式存储的消息、或者由于密钥被窃取或通过密码分析获取后对消息进行解密，在以上几种情况下都可能发生这种攻击。

This can happen to messages being transmitted in the clear, transmitted encrypted but stored in the clear, or decryption of messages due to stolen key or cryptoanalysis.

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