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A Mobile Ad hoc NETwork (MANET) is a self-organized system comprised of mobile wireless nodes with peer relationships. Due to multi-hop routing and absence of any trusted third party in open environment, MANETs are vulnerable to attacks by malicious nodes. In order to decrease the hazards from malicious nodes, we introduce the concept of trust to MANETs and build a simple trust model to evaluate neighbours' behaviours-packet forwarding. Extended from AODV route protocol, a trust-based reactive multipath routing protocol for MANETs, termed as Ad hoc On-demand Trusted-path Distance Vector (AOTDV) is proposed. This protocol discovers multiple loop-free paths which are evaluated by hop count and trust. The two-dimensional evaluation provides a flexible and feasible approach to choose a shortest path in all trusted paths to meet the dependable or trust requirements of data packets. Performance comparison of AOTDV and other related routing protocols shows that AOTDV is able to achieve a remarkable improvement in packet delivery ratio and end-to-end delay and to reduce black-hole, gray-hole and modification attacks.

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