Finally, the trustworthiness of service is measured via evidence synthesis combining user feature similarity.
Based on this framework, we proposed an approach for filtering out malicious feedbacks and a trust metric to evaluate the trustworthiness of service provider.
Service reliability indicates the trustworthiness of service that service nodes provide; feedback effectiveness represents the trustworthiness of feedback that feedback nodes return; recommendation credibility expresses the trustworthiness of recommendation that recommendation nodes give.
The first is its reliance on user judgements of the trustworthiness of service providers, and the second is its reliance on a single layer of authentication.
We focus on two particular security problems, namely, its reliance on user judgements of the trustworthiness of service providers and its dependency on a single layer of user authentication to the Identity Provider.
However, a global trust value is independent from who evaluates trustworthiness of a service provider.On the one hand, the local (i.e., subjective) trust values provide means for considering the preference of each user in detail.
Most of the TR models proposed by the research community support local (subjective) trust values considering the customer preference in detail while measuring the trustworthiness of a service provider except Eigentrust, GridEigentTrust, Abawajy's model, and Unitec.
Trust Customization (Global reputation vs Local/Subjective trust values): When trust is derived from different parameters, it is possible to consider subjective interests and requirements that dependent on the entity evaluating the trustworthiness of a service provider.
If peer services provide honest recommendations, a service provider can accurately determine the trustworthiness of an unknown service requester.
The source of mutually trusted outputs can be rooted in any one of the three components constituting the CFaaS system shown in Fig. 2. Therefore, once a mutually trusted output source is available, the trustworthiness of the component services above it becomes irrelevant.
