*9.2. Impact on VANETs Applications*

We analyze the impact of location privacy scheme on the vehicular network applications that may be safety-related and comfort applications. Achieving a higher level of privacy certainly will need to reduce its impact on road network applications. However, dummy data or wrong information is disseminated in the network for anonymizing a vehicle, which significantly reduces the application services of the vehicular network. Supposing inaccurate information is circulated, how would the vehicles efficiently utilize the applications of VANETs? The existing scheme IndMZ [24] takes the help of fake pseudonyms to anonymize the vehicles. This scheme falls into two problems. The first one is the computation burden on the vehicles. Secondly, it affects safety applications. The generation of fake pseudonyms for anonymisation reduces the application service quality. A large number of fake pseudonyms may also suffer communication among vehicles. The TAPCS [25] scheme is based on the radio silence period to preserve vehicles' location privacy. The use of silence periods during communication networks such as in VANETs is dangerous for vehicles' safety. During silent modes, mobile nodes do not broadcast road network information such as emergency, accident, the danger of lane changing, etc., and how the other vehicles will know about the road status information at a certain period. Safety application is critical, and delays in information dissemination compromise driver safety on the road. Thus, the TAPCS has a higher impact on road safety applications than the proposed scheme CMC. There is no concept of a silent period and generation of fake pseudonyms in our scheme CMC that impact road safety and comfort application. CMC disseminates road status information on a timely basis and utilizes road context information for vehicle anonymisation. CMC reduces privacy impact on safety applications compared with IndMZ and TAPCS.
