# The Concept regarding Vehicular Communications Based on Visible Light Communication and the IoT
## 3 Implementation and Results
### Analysis of the Security Process and the Threats to Which the Network Is Exposed  
When there are security and privacy concerns, in order to ensure reliable communication between the sender and the recipient, we need to perform certain tests that can give us feedback on the VLC's compliance with the requirements imposed by other wireless systems. Therefore, the system proposed in this study aims to provide protection against external connections and rejects data assignment to other users outside the network or who may compromise the network. The proposed system does not fully behave like a commercial Internet network but, as shown by the simulation process, it provides the most important features: authenticity, confidentiality, integrity, and availability.  
The authenticity feature aims to limit the introduction of messages into the communication channel that may disturb the receivers and prevent them from transmitting messages. The privacy feature imposes limits on data access to prevent disclosure of communication routes or routes created between senders and receivers. The integrity feature maintains the accuracy of content throughout its transmission from source to destination. If available, it prevents authentication from being given to unauthorized users, while for others, it requires access keys, in addition to the username and password. For such a system based on VLC to meet the mandatory requirements, several critical issues must be addressed in the final implementation. In the case of much more established communications, the network layer assumes all responsibilities of protecting the data and keeping them private from all points of view, including the legal and the commercial perspectives. In terms of the VLC channel, it can be vulnerable to attacks within vehicular networks, and the confidentiality of the data transmitted between the vehicles may be endangered. The measurements and tests presented here were carried out to track how a VLC system can be protected from various types of attacks in the network, such as flooding attacks, poisoning attacks, and cache attacks. These types are the ones that could endanger the integrity of the system, and this study proves that the security breaches in the case of VLC are much more critical than in the case of standard VANET communications (Figure 5).  
According to the research carried out, the sources of and exposure to external risks can only come about when there are failures in the physical infrastructure or the system itself. Matrix data approaches and evolutionary determinants of attacks within the physical layers have been considered and these threats to VLC do not compromise data security and integrity. To penetrate a VLC network or a communication system based on this technology, dedicated modules and receivers are needed, and if the communication system behaves like a classic wireless network, the penetration procedure is difficult and the contamination time is relatively long (see Figures 6 and 7).  
Regarding the connectivity of such a network, the insertion of data packets capable of providing a perspective on the network through their iteration was also considered. Therefore, cascading data templates were used, and these were split into multiple data matrices that randomly populated the network. A premature conclusion regarding their capacity and accuracy should not be drawn, but, regarding the main aspect of security, there were many indications that confirmed that the data were in a network capable of providing them with a high degree of protection. As shown by Figure 8, no technical problems were encountered, and the data packet penetration process, which was constantly monitored, could not be derailed.  
Figure 5: Analyses regarding the risk to which the infrastructure is exposed.  
Figure 6: Report on the use of the communication channel in relation to the other active networks.  
Figure 7: Spectrogram of the created communication channel.