Research On Access Control Of Encrypted CAD Model Based On Task And Role

With the rapid development and widespread application of the Internet and CAD technology, product data security has become a new field of research. Sharing CAD model in collaborative environment of data security and product full life-cycle management is particularly important. Information hiding, digital watermarking and access control are now widely used in CAD technology. Especially, access control is the key technology of these. In the product life cycle management, the complexity of staff and the model particularly need to have a good access control mechanisms to ensure the security of data access. However, the current CAD system uses only in the data file level set user role and access, not give the CAD model of its own security mechanisms.Address the issue here, the paper firstly analyzes the existing access control model and then proposes a specific CAD model based on the Task and Role model encrypted access control model, the model inherits the traditional Role-based access control model and Task-based access control model. Secondly it gives User-Roles Assignment (URA), Roles-Task Assignment (RTA), Task-Permission Assignment (TPA), and other relations in actual research. To achieve the permission of dynamic activation and dynamic adjustment, the model adds the task and permission of state manager. In contrast to traditional access control model, the model not only has strengths of role-based access control model and task-based access control model, such as support for the principle of separation of duties, the smallest privileges principle, data abstraction principles, but also supports the permission dynamically updated and model encrypted. In the model encryption algorithm, we choose DES. For the DES encryption key is a major problem in the model, we need to set up a key management system. This paper also makes research on the theory and technical difficulties of model.In the practical application of the model, we use SolidWorks software. With SolidWorks API, we have made a plug-in feature, and use database as the storage tools.