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Cloud computing is a promising technology, which is transforming the traditional Internet computing paradigm and IT industry. With the development of wireless access technologies, cloud computing is expected to expand to mobile environments, where mobile devices and sensors are used as the information collection nodes for the cloud. However, users' concerns about data security are the main obstacles that impede cloud computing from being widely adopted. These concerns are originated from the fact that sensitive data resides in public clouds, which are operated by commercial service providers that are not trusted by the data owner. Thus, new secure service architectures are needed to address the security concerns of users for using cloud computing techniques.
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