同时利用属性证书的扩展项目解决用户的角色授权问题。
At the same time we use the attributes of an extension of the certificate to solve the authority of user's role.
通过对用户证书中的属性取值进行评估，把符合条件的用户分配给特定角色，从而达到了根据用户的特征及资历实施访问授权的目的。
By evaluating the value of user attributes in the user credential, a qualified user is assigned to a specific role. This allows access authorization based on user characteristics and qualifications.
论文介绍了角色规范属性证书和角色指派属性证书，讨论了基于角色的PMI体系结构，探讨了基于角色PMI的电子政务安全模型。
The role specification AC and role assignment AC are introduced, the role-based PMI architecture and the role-based PMI security model for E-government is discussed and researched in the paper.
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