Privacy Protection with Less Certificates in CITS Privacy is a very important feature nowadays on any shared system. This issue should be considered on deployed CITS (Cooperative Intelligent Transport Systems) in order to avoid tracking drivers who send continously messages containing their locations. The anonymity is ensured by changing the identity of drivers frequently. In addition to anonymity, authentication is highly required. An adapted PKI (Public Key Infrastructure) solves this issue. Each vehicle has a set of pseudonyms certificates (PC) which will be used to sign sent messages and will be used as a part of the driver id. Getting PCs from the PKI requires a reliable network for a period of time and is constrained for vehicles. Each vehicle manages a list of PCs dynamically. A PC is used for a limited period of time. When this period expires, the vehicle will use another PC. This paper proposes a method which reduces the number of PCs used by vehicles. Indeed, when a certificate is used by a vehicle, in order to introduce a confusion for any tracker, this PC will be exchanged with another driver PC. A tracker will be confused since the former vehicle will not be the owner of the previous PC. This exchange has to be recorded on the PKI with simple processes. This mechanism protects privacy and introduces another PC change method. It also reduces the PC costs for drivers. The evaluation of the work has been by done through a theoretical model and has proven that tracking of vehicles decreases very much.

Preliminary Considerations for a Cooperative Intelligent Transport System Cybersecurity Reference Architecture Cyber security and privacy are major challenges for interconnected automatic driving cars which rely on confidentiality, integrity, availability, authenticity, accountability as well as privacy of a cooperative intelligent transport system (CITS). The cars require detailed data about the environment on different levels to generate a comprehensive overview of the current traffic situation in real time to ensure their safe and secure movement. The availability, integrity, authenticity and accountability of data and its processing are a prerequisite for automated and interconnected driving. Additionally, confidentiality and privacy are main requirements for using CITS services. Cyber security is not only necessary for an efficient traffic management. Cooperative functions and coordinative autonomy is mandatory, since successful intentional attacks on a CITS in fact threaten human lives. There is a fundamental need for a comprehensive harmonization of safety and security aspects from the infrastructure provideru0027s perspective to ensure awareness and trust  and not solely from an original equipment manufactureru0027s (OEM) view. Especially cyber security is essential to make these cooperative traffic structures and autonomous interconnected driving technologies confidently available to society. In this paper, the approach for component identification, scoping, use case development, and the applied risk management method as preliminary work for the development of a comprehensive CITS cybersecurity reference framework is discussed. These steps are part of a currently ongoing research project.