Business process access control mechanism is a difficult problem in Web services composition application. Ac- cording to the current deficiency of research in BPEL4WS secure access control, an Activity-Oriented Dynamic Access Authorization Model for BPEL4WS（ADABM） was proposed. By dissolving the coupling relationship between the or- ganization model and business process model, ADABM refines the BPEL4WS access permission to activity level. The users can obtain the Web services access authorizations only when the corresponding activity meets th...
