Mobile Ad hoc NETwork (MANET) is a group of mobile nodes and need not be a centralized infrastructure in the network. Every single mobile node acts as both transmitter and receiver then it communicates directly if the nodes are in the same network. Intrusion detection is a software application that monitors network and finds when unauthorized users enters the network. To protect MANET from the attackers, designed an intrusion detection system is called Enhanced Adaptive ACKnowledgement (EAACK). When data packets are sent from source to destination the problems such as receiver collision, limited transmission power and false misbehavior report occurs. EAACK can also detect these problems by using the schemes- ACK, Secure ACK and Misbehavior Report Authentication. The data flooding attack causes Denial of Service (DoS) attacks by flooding many data packets in the network. Therefore, in this paper we propose a scheme called Period-based Defense Mechanism (PDM) to avoid data flooding in the network. Then consider the performance of PDM scheme by measuring the throughput and also to improve the performance. The simulation results show that the performance of MANET is increased based on throughput and delay.

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Mobile Ad Hoc Network (manet) Advanced Encryption Standard (aes) Digital Signature Algorithm (dsa) Data Flooding Throughput Period-based Defense Mechanism (pdm).