Dynamic Threshold Method of Establishing Trust in Open Environment

In incomplete information environment,there are many optimization problems in the process of automated trust negotiation(ATN) based on exchanging digital credentials,like how to disclose minimum credentials and obtain maximum authorized,negotiation optimization,et al.Based on an analysis of the ATN process by game theory,a quantitative approach of trust is proposed to compute trust value of each credential in the ATN process a trust negotiation system is established on the basis of the dynamic strategy.The dynamic-threshold,fluctuating with the negotiation process,is proposed for further optimization to reduce credentials disclosure.The case analysis and simulations show that the dynamic-threshold strategy can restrict the amount of disclosed credentials and improve efficiency of the negotiation process in the incomplete information environment.