Vehicular Ad hoc NETworks (VANETs) use the vehicles as nodes to communicate between the nearby vehicles. It can be used to inform about the traffic, road conditions and accidents which helps to improve road safety and traffic efficiency. Multi-hop data dissemination protocol is used to detect the insider attack and improve security. In order to improve the security holistic protocol has been developed. This simulation result shows that the scheme highly detects and avoids the insider/outsider attack.