基于用户的安全模型USEC ？
区分上述两类用户的安全和访问控制模型。
A security and access control model that distinguishes between these two classes of users.
此安全模型保证合法的用户可以访问网格资源；
This security grid model ensures that the legal user can access grid resouces;
此安全模型保证合法的用户可以访问网格资源；
This security grid model ensures that the legal user can access grid resouces;
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