Abstract
Mobile Ad Hoc Network is a infrastructure less network it is one of the most important and highly unusual application, which is famous among critical operations like warfare use, emergency recovery because of its self configuring nature of nodes. MANETs does not require any centralized administration, it dynamically forms a temporary network with the changing topology. Due to its open environment and irregular distribution of nodes MANET is vulnerable to malicious attack hence a new intrusion detection system named EAACK is introduced. This scheme demonstrates the complexity of malicious behavior detection rate in certain situations without greatly affecting the network performance. EAACK is a acknowledgment based intrusion detection system it is required to ensure that all the acknowledgment packets are authentic and unattained hence all the packets are signed digitally before they are sent out and till the receiver accepts, due to the usage of both digital signature and acknowledgment packet it causes a great network overhead. This paper proposes and enforces a hybrid cryptography technique in order to minimize the network overhead caused by digital signature.
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