Abstract: Edge computing is one of the important technologies for the future Internet. Due to the massive dynamic and heterogeneous edge devices in the edge network, some of these edge devices may be malicious. Malicious edge devices will disrupt data processing and transmission within the edge network. With the increasing number of edge devices, edge computing faces a serious trust demand. Therefore, this paper conducts an in-depth investigation of the trust issue in edge computing. Firstly, we review and classify the current research from the perspectives of edge trust management and edge trust evaluation. Then, we discuss and analyze the trust management system based on blockchain and the trust evaluation methods. Furthermore, we also analyze and discus the path planning of trusted data collection, trust incentive mechanism, collaborative trust evaluation, and the application of edge computing trust in the edge trust issue. Finally, according to the completed review and evaluation, we explore some challenges of trust problems in edge computing and suggest the directions that are worth our research effort in the future. 

Key words: edge computing, Internet of Things, trust, security