With the use of IoT technology, the Vehicular Ad-hoc Network (VANET) facilitates encrypted communication between vehicles to enhance road safety and traffic management. When it comes to the safety of communications between vehicles in a VANET or between vehicles and infrastructure, vehicle access control authentication is a crucial safety function. Also, original versions of all correspondence must be made available. Meanwhile, safeguards are needed to prevent the inappropriate disclosure of personal information and other forms of intrusion in autos. In addition, VANETs have difficulties such restricted bandwidth, high mobility, and scalability. In this work, we proposed SCAuthenticate as certificate-free authentication technique based on digital signatures that may be used in VANETs. Our method eliminates the need for sophisticated certificate administration, a problem plaguing public key infrastructures, and the key escrow problem, which affects identity-based frameworks. In addition, the Road Side Unit (RSU) saves time and space by using aggregate signatures instead of validating and keeping individual signatures on multiple messages from various cars. The proposed method utilized the MECDA and map to point algorithm. By using our strategy, malicious vehicles will no longer be able to undermine the security of VANETs. As a result, the proposed method significantly reduces the need for computational resources. Security and performance benchmarks reveal that our solution is superior to state-of-the-art alternatives.