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Providing security of communications in Mobile Ad hoc Networks (MANETs) is one of the most significant fields for researchers. In order to provide security, the first step is to recognize vulnerabilities and examine different implementable attacks regarding such networks. Secure routing is one of the most important security blind spots regarding MANETs. Security of routing in MANETs can be endangered by uncooperative behavior of nodes. Uncooperative behavior can be done selfishly by refraining from participation in routing or maliciously in the form of an attack against network. One of the most famous and devastating routing attacks regarding MANETs is Black hole. In Optimized Link State Routing (OLSR), as one of the most well-known proactive routing algorithms, Black hole attack can be implemented in different methods. In this paper, effects of different selfish behaviors and different implementations of Black hole on OLSR based MANETs is studied. In order to evaluate network parameters, network simulator (NS-2) tool has been used. Simulation results demonstrate that a special implementation of Black hole, compared to other implementations and selfish nodes, has had more destroying effects on the network. Furthermore, such an attack results in a reduction in routing overhead and delay in transmitting packets compared to basic OLSR. Keywords-Mobile Ad hoc Network; Black hole Attack; Selfish Node; OLSR

Injection and Evaluation of New Attacks on Ad hoc Proactive Routing Algorithms