除了允许讯息伫列验证讯息外，外部凭证还允许接收应用程序以进一步验证传送者。

In addition to allowing message Queuing to authenticate the message, an external certificate allows the receiving application to further verify the sender.

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这要求将外部可见的主机名的凭证存储在一个Cryptographic Message Syntax (CMS)密钥数据库文件中。

This requires that a certificate for the externally visible hostname be stored in a Cryptographic Message Syntax (CMS) key database file.

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步骤2：DataPower设备接收请求，从令牌中获取用户凭证，然后在一个外部的、遵从ldap的目录服务器中验证请求者的身份。

Step 2: the DataPower appliance receives the request, retrieves user credentials from the token, and authenticates the requester on an external, LDAP-compliant directory server.

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