An Intrusion Prevention System embedded AODV to protect Mobile Adhoc Network against Sybil Attack

Mobile Ad hoc Network (MANET) is a group of self-directed, self-organizing and freely moving mobile nodes connected through wireless links, without the support of any central infrastructure. In MANET, every node has a freedom to cooperate in data packet forwarding. MANET is susceptible to various kinds of routing attacks because of its dynamicity, mobility, open medium, and lack of central administration. Thus, security in MANET routing protocol is a vital issue and needs a mechanism to protect communication between nodes. In MANET, a protrusive attack which reduces the network performance is Sybil attack which theft the identities of genuine nodes and impersonate them and drops the packets. In this Paper, Sybil attack detection and prevention (SDP) mechanism is proposed which works as an intrusion detection and prevention system to detect and prevent the MANET against Sybil attack. The proposed SDP mechanism used historical profile analysis and blocking based mechanism that check the real-time as well as previous history of nodes to watch the behavior of Sybil node. Two scenarios of SDP mechanism have been implemented in NS-2 and evaluated with packet delivery ratio, normal routing load, delay and throughput. Accuracy of detection is checked with confusion matrix analysis and found that proposed system gives 90.7% and 97.85% true positive ratio in SDP-I and SDP-II scenarios respectively.

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