Trust models for services in cloud environment: A survey

Trust remains one of the biggest challenges in cloud computing. At the global level, users do not have enough knowledge about the trust, reputation and reliability of service providers. In cloud environments, consumers make complex decisions, requiring trust for several services and different reasons. These decisions cannot be grouped in isolation because they have many interrelated aspects, as these features affect each other in a dynamic way. This paper throws light on different Trust Models developed and their drawback with respect to resource security. A strong Trust Model is recommended to enhance the reputation of the services in Cloud. The aim of this paper is to give a classification of the most relevant of trust models in recent years. Moreover, a simple set of guidelines for matching the most suitable trust model category to a given service is provided in this work.