但是这种加密方式不能越过应用系统，实现应用系统用户对敏感数据的访问控制。
However, this encryption method can not cross the application system to achieve access control of sensitive data.
权限模型：权限模型允许对系统中的任何内容应用用户角色。
Permissions model: the permissions model allows user roles to be applied to any in the system.
在这个场景中，呼叫中心应用程序，也称MDM客户机应用程序，就是系统用户。
In this scenario, the call center application, also known as the MDM client application, is the system user.
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