Chain of trust (CoT) is one of the key technologies for constructing trusted system.As viewed from theories and application systems of CoT

this paper introduced several representative models and the latest investigations including noninterference-based CoT theory and composition security-based CoT theory firstly.Afterward

this paper expatiated advantage and shortage of two CoT theories in detail.Secondly

this paper introduced the development of application systems comprising static CoT and dynamic CoT

and analyzed the remote attestation technology of chain of trust

and presented the CoT systems in cloud computing environment

and analyzed the security deficiency of those systems

and then discussed the conformance testing and security evaluation for CoT application system.Finally

this paper put forward the research and development trend for CoT.