<![CDATA[In a MANET network that utilize AODV as the routing protocol, a routing table is updated every time there is a demand from a node. This can in turn create a security vulnerability, one of them is the possibility of sinkhole attack. Sinkhole attack is an attack that occurs when a routing table is being made or updated, where malicious node will advertise fake RREP to deceive the route making process so that all the data will go to the malicious node. Because of that, this research focuses on making a sinkhole attack detection system on MANET network. The proposed system uses detection algorithm that observes the difference between sequence number. Previous research has shown success in detecting malicious package by using RREQ message package, therefore a different approach will be used in this research in which the modification is made in the RREP processing by comparing the incoming RREP sequence number with the existing threshold so that a valid RREP can be identified from the fake one. Test result done in a simulation with OMNET++ shows that the implementation of the detection algorithm has successfully been done with an average detection rate of 97.5% and caused the increase of Packet Delivery Ratio performance when compared to the one without detection algorithm. But with the side effect of also increasing the routing overhead load of the network.]]>
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