Mitigate Black Hole Attack using Trust with AODV in MANET

Mobile Adhoc Networks (MANETs) are unstable and vulnerable to attack and so their security issues are critical and tougher to design and implement than for wired networks. Though various encryption methods are available to ensure authentication and authorization, they are relatively ineffective in MANET's due to their high computational requirement. To overcome this various trust based mechanisms have been proposed in literature. This work proposed Weighted Trust. Adhoc On Demand Distance Vector (WTAODV) in which a trust model is implemented over AODV to mitigate black hole attack in MANET. Direct/indirect trust is computed using normalized Route Reply misbehavior factor, link quality and neighborhood trust. Simulations show improved Packet Delivery Ratio of over 15% for different scenarios.