Access Control Scheme for Workflow

Access control is an important security measure in workflow system. Based on the analysis of many access control models, by emphasizing the weakness existing in the present workflow system, a new access control model is proposed with the introduction of task set, task flow, time constraint and the formalized definition and relevant algorithm. It overcomes the shortcomings of the traditional model based on the role access control that has bad dynamic adaptivity of authority assigning, no flow control and time constraint. The model can therefore enhance the security and practicability of the workflow system.