A Trust Based Technique for Defense Against Denial of Service Attack Using Enhanced Optimized Link State Routing in Mobile Adhoc Network

摘要

In MANET a proactive algorithm, the Optimized Link State Routing (OLSR) protocol is mostly choose for quite economical in information measure utilization and in path calculation, however it’s susceptible to numerous attacks like ink withholding attacks and link spoofing attacks,flooding attacks replay attacks and black-hole attacks, colluding misrelay attacks. The node isolation attack is one of the prominent DoS against Optimized Link State Routing Protocol. It occurs when topological knowledge of the network is exploited by an attacker who is able to isolate thevictim from the rest of the network and subsequently deny communication services to the victim. In early, Denial contradiction with fictitious node mechanism have been proposed for node isolation attacks, however, these solutions not compromise routing efficiency or network overload due tomore nodes are used for fictitious node mechanism, so a new solution named as Enhanced OLSR protocol for both conditions of with and without contradiction made by 2hop reply and 2hop request and Node existence quire. Where the protocol has no need additional features of fictitious node mechanismso it can minimize the network lifetime and improve the efficiency of the network system and which proved better performance when compare to all other previous method.