A Fog-Based Hierarchical Trust Mechanism for Sensor-Cloud Underlying Structure

In recent years, Sensor-Cloud has become a hot issue. In this structure, there are some security problems that can be well solved by trust mechanism. However, there are some deficiencies in existing trust mechanism, especially for the Sensor-Cloud underlying structure. We propose a fog-based hierarchical trust mechanism for these deficiencies. This hierarchical structure is not only easy to establish and implement, but also moves heavy and fine-grained data analysis tasks to the fog layer. The experimental results indicate that this fog-based hierarchical structure can deal well in saving network energy, guaranteeing a fast malicious node detect speed, detecting hidden data attacks and recovering misjudgment nodes in an allowable delay range.