A Secured iTrust Key towards Periodic Trust Establishment in Delay Tolerant Networks

Abstract

Malicious and selfish behaviors represent a serious threat against routing in Delay/Disruption Tolerant Networks (DTNs). Due to the unique network characteristics, designing a misbehavior detection scheme in Delay/Disruption Tolerant Networks (DTNs) is regarded as a great challenge. In this paper, we propose iTrust, a probabilistic misbehavior detection scheme, for secure Delay/Disruption Tolerant Networks (DTNs) routing towards efficient trust establishment.The basic idea of iTrust is introducing a periodically available Trusted Authority (TA) to judge the node's behavior based on the collected routing evidences and probabilistically checking. We model iTrust as the Inspection Game and use game theoretical analysis to demonstrate that, by setting an appropriate investigation probability, Trusted Authority (TA)  could ensure the security of  Delay/Disruption Tolerant Networks (DTNs) routing at a reduced cost. To further improve the efficiency of the proposed scheme, we correlate detection probability with a node's reputation, which allows a dynamic detection probability determined by the trust of the users. The extensive analysis and simulation results show that the proposed scheme substantiates the effectiveness and efficiency of the proposed scheme.