Abstract
In this study, we originally propose the conceptual model and formal definitions for a trustworthy Collaboration-as-a-Service ecosystem, and construct a Bi-trustworthy cloud collaboration service (Bi-TCCS), which is a scheme based on an innovative bilateral social feedback (referred to as “bi-feedback”) mechanism. First, a trust-aware collaboration service model is proposed based on cloud service brokerages (CSBs), which can provide intermediation and aggregation capabilities to enable organizations to deploy their services across a collaborative cloud environment. Then, we propose a bi-feedback mechanism based on the inherent social relationship among three network communities, which are composed of three types of network entities: cloud users, CSBs, and cloud service providers. The proposed mechanism is effective and reliable against garnished and bad-mouthing attacks resulting from the traditional social feedback mechanism. Moreover, we innovatively adopt an aggregating method for overall trust based on deviation analysis. This method can minimize errors and overcome the limitations of traditional schemes, where trust attributes are weighted manually. Theoretical analysis and experiments verify the effectiveness of Bi-TCCS.
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