The global decision-based trust evaluation mechanism has been adopted extensively in previous studies. In fact, this trust evaluation mechanism can cope with a few AIDs; however, when a large number of AIDs exist in CIoT, it becomes unreliable if the global decision is still used as a benchmark to verify the consistent of the local decision, because the global decision made by the FC may be compromised. Hence, it is indispensable to devise a robust trust evaluation mechanism that can verify the consistency.