Cloud computing plays a major role in smart cities development by facilitating the delivery of various services in an efficient and\neffective manner. In a Peer-to-Peer (P2P) federated clouds ecosystem, multiple Cloud Service Providers (CSPs) collaborate and\nshare services among them when experiencing a shortage in certain resources. Hence, incoming service requests to this specific\nresource can be delegated to other members. Nevertheless, the lack of preexisting trust relationship among CSPs in this distributed\nenvironment can affect the quality of service (QoS). Therefore, a trust management system is required to assist trustworthy peers\nin seeking reliable communication partners. We address this challenge by proposing TrustyFeer, a trust management system that\nallows peers to evaluate the trustworthiness of other peers based on subjective logic opinions, formulated using peers� reputations\nand Service Level Agreements (SLAs). To demonstrate the utility of TrustyFeer, we evaluate the performance of our method\nagainst two long-standing trust management systems. The simulation results show that TrustyFeer is more robust in decreasing the\npercentage of services that do not conformto SLAs and increasing the success rate of exchanged services by good CSPs conforming\nto SLAs.This should provide a trustworthy federated clouds ecosystem for a better, more sustainable future.
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