The beacons contain important information about vehicles and the environment, for example, direction, acceleration, speed, road conditions, weather conditions and so forth. Connecting vehicles in wireless one hop communication poses many tasks such as authentication of newly joined vehicles, the need to protect the identity of the user, interruptions, providing multi hop communication, high heterogeneity (depending on whether the cars are congested in a big city or in a suburban area). Much of the research on ITS cybersecurity focuses on network security [2; 3; 4; 5].  
Reference [6] indicates the importance to maintain connectivity of nodes with software-configurable security services that ensure protection. This need is dictated by the characteristics of VANET--high dynamics in changes of network topology, uncertain structure, unclear network perimeter, high mobility, enabling and disabling of nodes.  
Reference [7] compares the two main technologies for VANET--cellular and based on Wi-Fi. It points out that knowing the strengths and weaknesses of each technology is a step towards stable and secure communication in VANET.  
In Reference [3] the authors emphasize the need of an efficient and secure authentication and privacy scheme and offer storage a group of aliases through a bloom filter. The experiment will be discussed in more detail in Section 5.  
VANETs are not the only vulnerable component of ITS. Cybersecurity in a system as complex as ITS takes place on all levels. Efforts to automate transport have led to the application of Fog and Cloud computing, artificial intelligence and machine learning in ITS. This can significantly slow down the actual application of fully automated vehicles due to the complexity of ensuring cybersecurity. The non-technological aspect of ITS security should not be underestimated. It is expressed in careful consideration of authorization policy, development of standards, governance, policy, regulation, awareness and education [8].  
In Reference [9] the authors overview the main ITS enabling technologies--smart vehicles, public transportation, IoT devices, networking and summarizes the issues by linking them to the relevant components in ITS. The authors argue that the most outstanding advantage of removing the human factor during the driving task is that traffic safety will be improved. In order to achieve that a cybersecurity strategy should be established. The authors highlight the role of the politics and the necessity of international benchmarked regulatory framework.  
Reference [10] emphasize the connection between Connected Automated Vehicles (CAVs) and road safety. The authors consider that standardization of procedures, education of the society and establishing dedicated communication networks for additional security between communicating vehicles are important ways to implement cybersecurity in CAV.  
In Reference [11] the focus is on certifications and audits based on standards and regulations developed in cybersecurity for CAVs. The main difficulty is the complexity of the system combining robotic vehicles and vehicles driven by humans, pedestrians, cyclists and so forth. Another aspect is social IoT enabling Mobility as a service (MaaS). There are significant unanswered questions concerning privacy and the reliability of the information. The answers to these questions will largely determine what ITS will look like in the future. The authors believe that a very restrictive regulation will slow down CAVs development and real-world deployment but this is a necessity to prevent safety and security from being sacrificed by commercial interests.