**7. Performance Analysis**

In this section, we analyze the proposed scheme's performance with the help of various experimental results. First, we discuss the performance of CMC under various traffic densities with the pseudonym update process. The proposed scheme CMC consists of both pseudonym change and exchange processes under diverse traffic conditions. We analyzed the anonymisation with the pseudonym change and exchange process as shown in Figure 10. During the pseudonym changing process, vehicles with high traffic density, i.e., have a higher number of neighbors in transmission range, the anonymisation of vehicles is improved. The pseudonym exchange process has lower anonymity due to fewer neighbors in transmission range. Depending on the process of pseudonyms update under various vehicle traffic conditions, the vehicle identity anonymisation is certainly different. A higher number of vehicles in a region that can change pseudonyms cooperatively will improve identity protection. Figure 11 shows the number of pseudonyms updated for various vehicle densities. We take two traffic densities. The lower traffic density case contains fewer vehicles in a road region, while higher density means a higher number of transmission range vehicles, as given in [52]. A higher number of vehicles taking part in the pseudonym update process increases identity protection. The figure clearly shows that a higher number of pseudonyms are updated during higher traffic conditions, which improves the anonymity of a vehicle in the crowd.

**Figure 10.** Anonymity of pseudonym change and exchange process.

**Figure 11.** The number of pseudonyms updates at various vehicle densities.
