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Since the inception of service-oriented computing paradigm, the authors have witnessed a plethora of services deployed across a broad spectrum of applications, ranging from conventional RPC-based services to SOAP-based Web services. Likewise, the proliferation of mobile devices has enabled the remote "On the move" access of these services from anywhere at any time. Secure access to these services is challenging especially in a mobile computing environment with heterogeneous modalities. Conventional static access control mechanisms are not able to accommodate complex secure access requirements.
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