Securing Multi-IRS Aided mmWave Communications Against Eavesdropping and Jamming in Vehicular Cyber Physical Systems

Intelligent transportation systems (ITS) will be dependent on inter-vehicle communication technology to run systems responsible for road safety, traffic flow, information and entertainment. As with standard communication systems, vehicle communication systems may be abused or attacked in ways that could compromise the transport systems and the security of drivers and their vehicles. Millimeter Wave (mmWave) communications are anticipated to play a significant part in this communication. This paper investigates securing the communications with mmWave by employing physical layer security through several Intelligent Reflecting Surfaces(IRSs) to secure communication network from both eavesdropping and jamming attacks. By utilizing multiple IRSs to generate numerous links of transmission among a receiver user and a number of base station antennas in the existence of a single eavesdropper and jammer. By optimizing both the phase shifts at passive IRSs beamforming and the active beamforming at the base station, we were able to boost the secrecy rate over multiple intelligent reflecting surfaces networks functioning in the mmWave radio spectrum. However, because the specified issue is non-convex, we provide an efficient approach that relies on alternating optimization to achieve a suboptimal solution. The outcomes of this study highlighted the benefits of leveraging several IRSs in the mmWave system to enhance the rate of security. Additionally, it was found out that IRS can be proposed to assist jammers in attacking legal users without requiring any internal energy to generate jamming signals, while eavesdropping can mitigate the harmful effects of jamming. The proposed strategy can successfully raise the secrecy rate of legitimate users by jamming the eavesdropper with multiple IRSs in mmWave networks, according to simulation results.