Abstract: Adhoc network is a collection of wireless networks. Each node communicate in a radio communication range. A MANET is a group of multi-hop wireless adhoc networks. Each node transfer the message to the other node through the wireless networks. This network is not fully secured so there are more chances of attacker .The success of mobile adhoc network depends on people’s confidence in its security. To identify the malicious node different techniques are used. This paper is going to deal with the malicious node for secure data transmissions.

Keywords: MANET, Adhoc network, malicious node, data transmissions, wireless networks.