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The current focus of enterprises on automating processes has led to the extensive application of workflow management systems. It has previously been difficult to integrate traditional workflow management systems with other types of systems, but the rapid development of Web services has solved communication problems between heterogeneous platforms and allowed for the efficient integration of legacy systems. This paper reports the design and implementation of a secure Web-services based workflow management system that can effectively integrate heterogeneous platforms. Moreover, the developed WS-Security application framework can be rapidly and inexpensively applied to current system architectures.