Trust Based Bayesian Inference and Dempster-Shafer Theory to Achieve Security in MANET

information technology

MANET consist of many small devices communicating spontaneously over the air (wireless).The topology of the network is changing frequently because of the mobile nature of its nodes. Ad hoc finally induces that there are no such things as fixed routers, therefore every node has to act as a router for its neighbors. Trust-based schemes are considered as effective mechanisms associated with cryptographic techniques for thwarting a variety of attacks. Because of the properties of MANET, trust establishment needs an intelligent approach to identify attackers’ misbehavior. A routing protocol for MANET should give incentives for acting correctly and it should be able to detect misbehaving nodes and punish them. In MANET no priori trust relationships and no central trustworthy authorities exist. The goal is to establish trust relationships by using a reputation-based trust management scheme. This can be done by getting reputation for a node and combining this with personal observations about its behavior. Bayesian interface is used for direct observation and Dempster-Shafer theory is used to calculate trust value based on indirect observation.

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