A large sensor network with the individual sensor nodes focus to the security factor. A node injected into the sensor network for the data forwarding, causes some attacks. Such attacks lead to the injection of false data in the wireless sensor network. Wireless sensor networks are organized at aggressive backgrounds with most vulnerable attacks. In a large scale wireless sensor network, detecting reports injected by compromised nodes is a large research confront. Once a node is compromised, all the security information accumulates in that node turn out to be accessible to the attacker.In such sensor network, the improved authentication system is developed in research work to improve the security level by filtering the injected false data. The WSN focus on removing the injected false data attack and their mitigation technique is developed for high security maintenance. Perform the high security with the filtering of the injected false data should also be executed as early as possible. © 2016, Scientific Publishers. All rights reserved.