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Cloud computing with its inherent advantages draws attention for business critical applications, but concurrently expects high level of trust in cloud service providers. Reputation-based trust is emerging as a good choice to model trust of cloud service providers based on available evidence. Many existing reputation based systems either ignore or give less importance to uncertainty linked with the evidence. In this paper, the authors propose an uncertainty model and define their approach to compute opinion for cloud service providers. Using subjective logic operators along with the computed opinion values, they propose mechanisms to calculate the reputation of cloud service providers.
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