Secure communication of VANET over DSRC with 802.11 standard and identifying accurate attacker vehicles is a major challenge over VANET. Reducing cost of computation, effective consumption of limited resources and providing uncompromised security has always been a challenge over VANET. In this paper, an encryption algorithm based encryption and decryption approach and implementing of boundary with single or double RSU has been simulated using MATLAB software. The authors propose a security system for VANETs to achieve privacy desired by vehicles and traceability required by law enforcement authorities, in addition to satisfying fundamental security requirements including authentication, non-repudiation, message integrity and confidentiality.