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

CAD model, the product of intellect and painstaking of both the factories and the designers, has great economic value for involving valuable intellectual properties. Security accessing mechanism in collaborative conditions plays a key role of the product model protection in availability, integrity, confidentiality and effectiveness. However, as research on CAD accessing control model in collaborative case has lagged behind those in other areas, its application can not meet the need of current situation, and the traditional accessing control methods can not adapt well to the special needs of collaborative conditions. Therefore, to research into security Access Control for CAD Models in Collaborative Environment has been an urgent project.Security issues on sharing CAD model in network conditions had been got researched In this paper, with focus on the technology of CAD accessing control model in collaborative conditions. In accordance with the levels of structure and the flows of collaborative design processing associated with interaction and relevance, a task-role-based multi-level and dynamic security accessing control model for CAD in collaborative environment was brought forward. The new model is developed to simplify rights definitions and assigning processes, improve the expression ability, and help to realize multi-grained accessing control. It realizes dynamic authorization management by introducing the reliance among rights and transference in states. Base on the new model, the overall structure of accessing control system was put forward and got designed in detail. The new system, which had been realized in a project, can do fine-grained controls to CAD model which the traditional PLM system fails to. It ensures the security and efficiency level-access to CAD model in network collaborative situation, and also the security during the process of developing, model sharing and managing.My achievements are as follows: (1) A task-role-based multi-level and dynamic security access control model was brought forward, (2) The overall structure accessing control system of a CAD model was put forward and got designed in detail. (3) The accessing control model project was realized in the course of the completion of 863 national plans "Issues of data security technology of the CAD sharing model in Network "in this pape.