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In Vehicle-to-Everything (V2X) systems, reliable and secure informationexchange plays a pivotal role in road safety and traffic management. Due to theopen nature of the wireless medium and the constant or intermittent mobility ofvehicles, the security of transmissions in V2X is more challenging compared totraditional wireless networks. Physical layer security (PLS) leverages theinherent randomness of wireless communication channels to ensure theconfidentiality and security of information transmission. Current PLS schemesin integrated communications and sensing (ISAC) enabled V2X systems is toutilize communication interference to significantly impact the eavesdroppingchannel more than the legitimate channel. However, in an ISAC-enabled V2Xsystem, it is crucial to prioritize and address the issue of interferencecoupling as it significantly impacts the confidentiality and security ofinformation exchange. This goes beyond simply relying on the communicationinterference. Until now, no discussions or studies on integrating security withISAC (Seucue-ISAC) in ISAC-enabled V2X systems, specifically regarding theexploitation of sensing interference or coupling interference. In this article,we provide a comprehensive review on PLS metrics and security threatsencountered in V2X communication. And then, we discuss and analyze four popularPLS techniques and the main challenges associated with their implementation inISAC-enabled V2X systems. Finally, we share our vision for PLS studies inISAC-based V2X systems to promote Secure-ISAC.

Secure-ISAC: Secure V2X Communication: An Integrated Sensing and Communication Perspective