Lastly in Section 5 our conclusion is given.2.?Related WorkMaxim et al.  presented the need and importance of security in VANETs. In order to fulfill the security requirements, they proposed a security architecture which will provide security and privacy. VANETs depend on vehicle to vehicle communication, which allows a malicious node to send malicious data over the network. Golle et al.  proposed a technique to detect and correct the malicious data in VANETs. His technique is based upon the sensor data, collected by vehicles in the VANETs and neighbors information. Redundant information from neighbors and the position of vehicles help detect the malicious data.Xiao et al.
 proposed a scheme to localize and detect Sybil vehicles in VANETs on the basis of the signal strength.
With the help of signal strength a vehicle can verify the position of other vehicles and eliminate the malicious nodes. Xiao first proposed position verification techniques with the help of signal strength but it still has some shortcomings i.e., spoof attacks are possible and data is inconsistent. In order to overcome this weakness, he proposed another solution to prevent malicious nodes in VANETs. Two static algorithms are proposed with the help of traffic patterns and base stations. These algorithms are designed to verify the position of the vehicle Cilengitide and reduce the effect of malicious nodes on communication in VANETs.
The following benefits are achieved by using this algorithm:Error rate is reducedMalicious nodes are easily detectedIt is not hardware dependentIn order to improve performance, selfish or malicious nodes must be captured and removed from VANETs, but it is very difficult to detect these nodes due to the lack of infrastructure and the dynamic nature Anacetrapib of VANETs compared to any other ad-hoc networks. Raya et al.  also proposed a feasible framework adapted to the features of the vehicular environment. It detects and prevents the effects of malicious nodes in a VANET scenario.3.?Proposed FrameworkOur proposed SMBF framework is composed of four modules: Redundant Information, Message Benefit, Malicious Node Verification (MNV) and Malicious Data Verification (MDV) as shown in Figure 1. SMBF consists of the steps which are given below:Step 1) Vehicle A wants to share a safety message with Vehicle BStep 2) SMBF sends message to redundant information for verificationStep 3) On the basis of the reply, SMBF decides to forward or discard the message.