Cloud computing offers massively scalable, elastic resources (e.g., data, computing power, and services) over the\r\ninternet from remote data centres to the consumers. The growing market penetration, with an evermore diverse\r\nprovider and service landscape, turns Cloud computing marketplaces a highly competitive one. In this highly\r\ncompetitive and distributed service environment, the assurances are insufficient for the consumers to identify the\r\ndependable and trustworthy Cloud providers.\r\nThis paper provides a landscape and discusses incentives and hindrances to adopt Cloud computing from Cloud\r\nconsumers� perspective. Due to these hindrances, potential consumers are not sure whether they can trust the Cloud\r\nproviders in offering dependable services. Trust-aided unified evaluation framework by leveraging trust and\r\nreputation systems can be used to assess trustworthiness (or dependability) of Cloud providers. Hence, cloud-related\r\nspecific parameters (QoS+) are required for the trust and reputation systems in Cloud environments. We identify the\r\nessential properties and corresponding research challenges to integrate the QoS+ parameters into trust and\r\nreputation systems. Finally, we survey and analyse the existing trust and reputation systems in various application\r\ndomains, characterizing their individual strengths and weaknesses. Our work contributes to understanding 1) why\r\ntrust establishment is important in the Cloud computing landscape, 2) how trust can act as a facilitator in this context\r\nand 3) what are the exact requirements for trust and reputation models (or systems) to support the consumers in\r\nestablishing trust on Cloud providers.
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