Developing Secured MANET Using Trust

Distributed nature of Mobile Adhoc NETwork (MANET) and dynamically varying topology lead to a number of security threats in MANET. Malicious behavior of the participating entity disrupts normal functioning of the network. Moreover one major problem with continuous participation of nodes in MANET is energy consumption which often leads to selfish behavior of participating entity. Here we propose a distributed trust based framework to ensure secure packet delivery in a hostile MANET. In this regard Bayesian network based trust management scheme is used to infer trust of a node using prior interaction history. Besides, we introduce an energy factor which is the ratio of remaining energy of a node to the initial energy of the same. These are merged towards aggregate trust of a node so that future behavior of a node can be anticipated more precisely. Performance is evaluated in discrete event simulation environment. Results show that the proposed scheme not only detects the malicious nodes but also improves performance of routing protocol.