Research And Design Of Trust Evaluation Based On Behavioral Temporal And Spatial Features In Distributed Network

As a distributed network, the Internet is difficult to use centralized trust management mechanism in the traditional centralized network environment. As a result, the entities has malicious behaviors such as fraud in the interaction process, which makes it is difficult to guarantee the system's validity and usability. Obviously, the traditional centralized trust management mechanism is no longer suitable for large-scale distributed network environment. Based on the interactions between entities, the trust management mechanism carries out dynamic trust evaluation process to obtain the comprehensive trust evaluation of the network entities.In this paper, we study the problems of trust evaluation model of static credit of users and devices, and study the trust evaluation methods based on the temporal and spatial characteristics of entity behaviors in distributed network. Combining with the related avenues of research, the trust evaluation model based on the temporal and spatial characteristics of the entity behaviors is constructed, and the actual characteristics of the distributed network are combined to improve the accuracy, objectivity and survivability of the trust evaluation model. The main contents of this paper are as follows:(1) Based on the existing trust management method and the cloud model, this paper proposes a method of selecting trust computing entities,which makes use of the conversion method of the trust cloud model that is from quantitative to qualitative. Conduct a comprehensive trust assessment of the entities to select the trusted entities among the candidates.(2) A robust distributed trust management method is proposed to evaluate the trust value of participating nodes and defend trust evaluation framework against malicious attacks in distributed network. The trust value of each individual node is evaluated by three parts: direct trust, recommend trust and indirect trust. This module also establishes a penalty mechanism for the malicious behavior of the entity and takes into account the ime-attenuation characteristic of the trust.(3) A novel trust updating mechanism based on sliding window is proposed in this paper, which incorporate into two essential properties of trust relationship: time-attenuation characteristics and "fast-fall, slow-rise updating pattern. Through the trigger mechanisms for updating the sliding window and integrated evaluation of trust records within the window. This method effectively controls the time-attenuation characteristic of trust,which ensures the trustworthiness and extensibility of trust evaluation.