Connected Autonomous Vehicles (CAVs) are drive-less vehicles that equipped with sophisticated technologies that provide safe and efficient transportation for the users. The automated and connected nature of a CA V make them vulnerable to cyber attack. There have been various solutions proposed recently for establishing security in the communication. Majority focuses on security services such as confidentiality, integrity, availability and authentication. This paper analyzes the most recent concepts that have been discussed in the literature to protect the CA V s from the attackers as well as introduce our new security framework that can address the gaps in the current security knowledge by extending our previous ideas and solutions.