Trust management method based on backward inference

The invention discloses a trust management method based on backward inference. The trust management method based on the backward inference comprise a trust evaluation module and a trust punishment module, wherein an operation process of the trust evaluation module comprises the following steps: generating satisfaction degree evaluation among nodes through transaction among the nodes, and adopting a multiple evaluation mechanism to calculate a direct trust value of the evaluated node; utilizing a cosine similarity formula to obtain a similar node set, and calculating an indirect trust value of the evaluated node; combining the direct trust value and the indirect trust value to calculate a comprehensive trust value of the evaluated node; comparing the comprehensive trust value with a trust threshold value, and marking the evaluated node; and generating a node sequence with a mark. The operation process of the trust punishment module comprises the following steps: inquiring the comprehensive trust value for the mark node by other nodes; according to different node marks, looking for and punishing a malicious node; punishing the malicious node to lower the reputation value of the malicious node; calculating the final reputation values of all nodes; and generating a node sequence subjected to devaluation sorting according to the reputation values. The punishment mechanism is introduced in, so that an evaluation result is more accurate.