关键词: 信任评估, 时滞弱化, 二阶导数, 信度趋势, 策略波动

Abstract: To reduce the negative impact of the inherent time lag property of trust evaluation on the result of evaluation, new time lag weakening policies for enhancing trust evaluation reliability were proposed by integrating the trust trends of target entity into trust evaluation process with second derivative as the measurement tool. In order to check the effectiveness of this strategy, with the idea of reverse engineering, the authors used it to extend the famous trust revaluation model proposed by Srivatsa. The results show the parts of trust evaluation result with the extended model is closer to the real behavior of the target entity than that of the original model, and the former is more capable of inhibiting the fluctuating behavior of malicious entity. All of these indicate that the time lag weakening policies can be used to enhance the reliability of trust evaluation.

Key words: trust evaluation, timelag weakening, second derivative, trust trend, strategy fluctuation