Access Control Model for Web Services Based on Process

A new kind of access control model——PBACWS(process based access model for Web Services) is invented concentrating on the low coupling and dynamic change characters of Web Services.Under the PBACWS model,concepts of meta service and meta permission are put forward to give better description of Web Services and it changes the tradition way of assigning user with role to use service permission token as the authorization entity.In this model,more effective access control for Web Services is made through assigning the task process with the dynamic service permission token.