ABSTRACT
Cloud entities: These can be the resource, clients, services in the cloud, or the nodes in the cloud that owns some resource.
1 INTRODUCTION
The internet can be used to realize resource sharing, cooperation, resource dynamic aggregation, and resource allocation by cloud, which makes the trust relationship different between cloud and traditional network[1]. Although the cloud GSI mechanism provides some security measures such as identity authentication and communication encryption, one cannot make sure that each entity in the cloud is a good entity. Trust is an important factor to improve cloud security. It can provide more accurate and reasonable evidence for security decisions, so as to offer more protection for the cloud. Trust has become a research hotspot in cloud security field.
