A Trust Model Based on Subjective Logic

In order to resolve the trust problem due to the opening, the dynamics, the anonymity, and the uncertainty of system, this paper proposes a new trust model by analyzing and improving the subjective logic. A new trust quantification formula with the negative-event and time effects is introduced, and a definition of risk is also presented. We can evaluate the trust relationships between peers more precisely and prevent the hidden security dangers of cooperative cheat and slander more effectively; thus we can more effectively resolve security problems existing in practical computing environment.