这个密码用于在客户端上加密私有密钥文件。
This passphrase will be used to encrypt the private-key file on the client side.
与简单的UsernameToken示例相比，使用私有密钥-证书对进行消息签名和加密的配置比较复杂。
Using private key-certificate pairs for signing and encrypting messages is more complex to configure than the simple UsernameToken example.
尽管ssh - keygen命令可以接受空的密码，但是在这种情况下私有密钥文件不加密。
Even ssh-keygen command will accept the empty passphrase, in which case, private-key file will not be encrypted.
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