Research on an UCON Model Supporting Distributed Workflow

By analyzing the traditional workflow access control models and UCON core model, a UCON_TR model based on UCON and capable of supporting distributed workflow is proposed in this paper. The introduction of role and task is the critical differentiator of UCON_TR relative to UCON. Then formalized description and analysis of the model are presented. Finally, the implemental architecture of UCON_TR model in distributed, multi-domain environment is provided. With the redefinition of role and task and the introduction of domain, UCON_TR model resolves traditional workflow access control models´ limitations existing in their implements in distributed, multi-domain environment and has features of highly dynamic authorization and versatile authorization mechanism and the requirements of modern access control can be satisfied better.