Abstract:

In view of the problem of low flexibility and complex structure of traditional delegation models, this paper introduces an improved delegation model named flexible delegation model based on permissions division, which is built on permissionbased delegation model. Instead of dividing roles, the permissions are divided into three sets in this model, which include delegable
 permission, semidelegable permission and undelegable permission. It realizes special permissions delegation and simplifies the structure of the model. The results show that this model makes the realization and management of the delegation more easy and flexible, at the same time it ensures the security of the system.

Key words: permissions division, delegation, role