Biblio

For the purpose of stealthiness, trigger-based Hardware Trojans(HTs) tend to have at least one trigger signal with an extremely low transition probability to evade the functional verification. In this paper, we discuss the correlation between poor testability and low transition probability, and then propose a kind of systematic Trojan trigger model with extremely low transition probability but reasonable testability, which can disable the Controllability and Observability for hardware Trojan Detection (COTD) technique, an efficient HT detection method based on circuits testability. Based on experiments and tests on circuits, we propose that the more imbalanced 0/1-controllability can indicate the lower transition probability. And a trigger signal identification method using the imbalanced 0/1-controllability is proposed. Experiments on ISCAS benchmarks show that the proposed method can obtain a 100% true positive rate and average 5.67% false positive rate for the trigger signal.

As the increasing demands of social services, unmanned aerial vehicles (UAVs)-assisted networks promote the promising prospect for implementing high-rate information transmission and applications. The sensing data can be collected by UAVs, a large number of applications based on UAVs have been realized in the 5G networks. However, the malicious UAVs may provide false information and destroy the services. The 5G UAV communication systems face the security threats. Therefore, this paper develops a novel trust-based security scheme for 5G UAV communication systems. Firstly, the architecture of the 5G UAV communication system is presented to improve the communication performance. Secondly, the trust evaluation scheme for UAVs is developed to evaluate the reliability of UAVs. By introducing the trust threshold, the malicious UAVs will be filtered out from the systems to protect the security of systems. Finally, the simulation results have been demonstrated the effectiveness of the proposed scheme.

With wide application of networked control systems(N CSs), NCSs security have encountered severe challenges. In this paper, we propose a robust event-triggered controller design method under replay attacks, and the control signal on the plant is updated only when the event-triggering condition is satisfied. We develop a general random replay attack model rather than predetermined specific patterns for the occurrences of replay attacks, which allows to obtain random states to replay. We show that the proposed event-triggered control (ETC) scheme, if well designed, can tolerate some consecutive replay attacks, without affecting the corresponding closed-loop system stability and performance. A numerical examples is finally given to illustrate the effectiveness of our method.