摘要：Mobile Adhoc Network (MANET) is a wireless communication mechanism. It is a collection of mobile nodes that have a dynamic infrastructure, due to its dynamic nature every node acts as a transmitter and receiver. MANET is capable of self configuring ,this unique feature make it ideal in various application like military use and emergency situation like medical ,natural disaster etc. Due to open medium and wide distribution of node, MANET is susceptible to malicious attackers thus there is a need to develop IDS (Intrusion Detection System) in order to protect MANET from attacks as security is of highest concern. However many IDS has been proposed by researchers to detect malicious (misbehaving) node in mobile adhoc network .All IDS will demonstrate its performance in terms of routing overhead and packet delivery ratio. The main objective of this paper is to observe and analyze the performance of Watchdog, TwoAck, AACK and EAACK. The result will provide positive performances against malicious node detection, however EAACK will demonstrate higher malicious detection rate in certain circumstances as compares to other IDS while does not greatly affecting the network performance. Keywords:-EAACK, Digital signature, MANET, Intrusion Detection system
