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The recent advances in cloud computing have risen a number of unforeseen security related issues in different aspects of cloud environments. Among these, the problem of guaranteeing secure access to computing resources in the cloud is gathering special attention. In this paper, the authors address open issues related to trust in cloud environments proposing a new trust model for cloud computing which considers a higher level view cloud resources. The widespread use of Internet connected systems and distributed applications have triggered a revolution towards the adoption of pervasive and ubiquitous cloud computing environments. These environments allow users and clients to purchase computing power according to necessity, elastically adapting to different performance needs while providing higher availability.
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