A Time-Related Trust Model Based on Subjective Logic Theory

Traditional subjective logic provides a specific belief calculus that uses opinion to express beliefs, but it does not support the time property. In the heterogeneous, dynamic, and open networks such as the Internet, we propose a time-related trust model based on subjective logic theory. The proposed model consists of two additional factors compared with the traditional one: a time-related attenuation factor that is defined to improve evidence mapping function, and a time-related weight factor that is defined to calculate trust using both direct trust and indirect trust. Simulation studies show that the proposed model has greater improvement on restraining malicious entities from increasing their trust by spurious behaviors than traditional subjective logic trust model.