In this paper, we address the problem of trust management in multi-cloud environments using a trust management architecture based on a group of distributed Trust Service Providers (TSPs). These are independent third-party providers, trusted by Cloud Providers (CPs), Cloud Service Providers (CSPs) and Cloud Service Users (CSUs), that provide trust related services to cloud participants. TSPs are...

Trust is not only essential in our daily lives, its importance in virtual networks should not be underestimated either. For example, we only use information found on the web when we trust the source, and we do not give our credit card details on sites we distrust. With the advent of the semantic web [2], intelligent web agents will be taking over more and more human tasks. Therefore, there is a...

The behaviour based trust models generally compute social trust using interactions of a member with other members, referred to as “friends”. These models largely ignore the interactions of friends with their friends, referred to as “friendship effects”. Results from social studies and behavioural science show that friends have a significant influence on the behaviour of the members in the commu...

We discuss a formal model for trust in Global Computing scenarios, focusing on the aspects of trust formation, evolution, and propagation. We focus on a particular abstract model, and illustrate its applicability on a simple example. We also discuss a possible operational model for trust based systems.

This paper introduces a mechanism to quantify propagation of trust in an e-commerce environment. Using principles derived from Dempster-Shafer theory of evidence, we propose a method to propagate and quantify trust. More specifically, we answer the question: if A trusts B, and B trusts C, then with how much certainty may A trust C? This reasoning can be extended to an arbitrary length of trust ...

We investigate trust propagation in delegation situations, which often occur in hierarchical organisations and coalition structures. In doing so we define a delegation chain representing the sub-delegation process. Such delegation chains present a problem for current trust evaluation mechanisms, which are unable to accurately divide trust among the chain members, resulting in degraded system pe...

Recommender systems in a travel guide suggest touristic sites a user may like. Typically, people are more willing to trust recommendations from people they know. We present a trust-based recommendation service for a mobile tourist guide that uses the notion of directly and indirectly trusted peers. The recommendations combine information about the peers ratings on sights, interpersonal trust an...

Collaborative filtering (CF) technique has been widely used in recommending items of interest to users based on social relationships. The notion of trust is emerging as an important facet of relationships in social networks. In this paper, we present an improved mechanism to the standard CF techniques by incorporating trust into CF recommendation process. We derive the trust score directly from...

A network of people having established trust relations and a model for propagation of related trust scores are fundamental building blocks in many of todays most successful e-commerce and recommendation systems. However, the web of trust is often too sparse to predict trust values between non-familiar people with high accuracy. Trust inferences are transitive associations among users in the con...