In order to solve the problem of how to evaluate the trusted degree of the nodes in the resource-constrained and topology-changed Ad Hoc networks

a scheme for evaluation of Ad Hoc nodes based on trust degree calculation and triple thresholds control has been put forward

improving the previous literature on the node trust evaluation mechanism.The accusation-based threshold is adopted to hang on a suspect node rapidly.The trust degree calculation-based threshold is used to revoke a node only when its trust value has reached the threshold value preseted according to safety requirements.The warning-based threshold is set to limit a potentially suspect node to launch a series of continuous malicious accusations to a legitimate node.Analysis and simulations show that the proposed scheme overcomes node revocation arbitrarily in the previous schemes in which node revocation is based on the number of accusations.Triple thresholds ensure a rapid response to malicious nodes

quantification of node trust and more accurate revocation of malicious nodes;moreover

it prevents illegal nodes from accusing legitimate nodes in collusion and then avoids a wrong revocation.