ABSTRACT:
Mobile ad-hoc networks (MANETs) have received drastically increasing interest, due to their potential applicability to myriad applications. The deployment of such network however, poses several challenging issues, due to their dynamic nature and other characteristics such as lack of fixed communication infrastructure, centralized administration, nodes mobility and dynamic topological changes which makes it susceptible to various security attacks such as single and cooperative black hole/gray hole attacks, sinkhole and eavesdropping attacks. The above mentioned attacks mainly disrupt the routing process by giving fake routing information in MANETs, thus implementing security is of primary concern in such networks. Previous works uses reverse tracing algorithm, cross-checking technique and the onion routing protocol to address attacks in MANETs, but the techniques lacks message encryption scheme to prevent unauthorized read/write of transmitted data by illegitimate nodes and cannot address sinkhole and eavesdropping attacks. This paper aim at incorporating RSA encryption algorithm to the cooperative bait detection scheme, which allows the use of public key cryptosystem to encrypt data before transmission, after the initial reverse tracing operations. It also eliminate the use of the threshold value used to indicate the reoccurrence of malicious nodes. The proposed work uses baiting procedure to tempt malicious nodes send fake RREPs and then uses the reverse tracing algorithm, test and recheck packets to detect malicious nodes, broadcast an alarm packet to the whole network with the list of malicious nodes detected telling the network nodes to stop further communication with this nodes and finally apply the RSA encryption algorithm to the data before transmission. The proposed work was simulated using network simulator tool NS2, and simulation results show that the proposed work shows an increase in network throughput by 26.67% and also show a decrease in routing overhead by 36.36% and end to end delay by 10% over the existing cooperative bait detection scheme (CBDS) taken as benchmark.
Keywords:
MANETs, Malicious node, RSA, Reverse tracing,
