ISSN (Print): 2328-3491, ISSN (Online): 2328-3580, ISSN (CD-ROM): 2328-3629 American International Journal of Research in Science, Technology, Engineering & Mathematics AIJRSTEM 13-244; © 2013, AIJRSTEM All Rights Reserved Page 149 AIJRSTEM is a refereed, indexed, peer-reviewed, multidisciplinary and open access journal published by International Association of Scientific Innovation and Research (IASIR), USA (An Association Unifying the Sciences, Engineering, and Applied Research) Available online at http://www.iasir.net DETECTING BLACKHOLE ATTACK IN WSN BY CHECK AGENT USING MULTIPLE BASE STATIONS Nitesh Gondwal 1 , Chander Diwaker 2 CSE Department University Institute of Engineering & Technology Kurukshetra University, Kurukshetra INDIA I. Introduction A WSN is composed of large number of sensor nodes which are distributed in the wireless environment. This feature allows a random distribution of the nodes in the disaster relief operations or inaccessible terrains and several other applications. The other applications [9] of WSN includes environmental control such as fire-fighting or marine ground floor erosion, also installing sensors on bridges or buildings to understand earthquake vibration patterns, surveillance tasks of many kinds like intruder surveillance in premises, etc. Due to the wireless nature and infrastructure-less environment of WSN, they are more vulnerable to many types of security attacks. Generally, the attacks are of two types in WSN- active attacks and the passive attacks. Black-hole attack is one of the harmful active attacks. II. Black Hole Attack Black-hole attack- In the black-hole attack, a malicious node advertises the wrong paths as good paths to the source node during the path finding process as in reactive routing protocols or in the route updating messages as in proactive routing protocols. Good path means the shortest path from source node to the destination node or the most stable path through the sensor network. Fig. 1 Black hole Attack [15] Abstract : Due to the wireless nature and infrastructure-less environment of WSN, they are more vulnerable to many types of security attacks. This paper proposes a technique to detect the black-hole attack using multiple base-stations and a check agent based technology. This technique is Energy efficient, Fast, Lightweight and Reduces message complexity. An effective solution is proposed that uses multiple base stations to improve the delivery of the packets from the sensor nodes reaching at least one base station in the network, thus ensuring high packet delivery success. The proposed technique is more efficient than the previous techniques and gives better results. Check agent is a software program which is self-controlling and it moves from node to node and checks the presence of black-hole nodes in the network. Routing through multiple base stations algorithm is only activated when there is a chance of black-hole attack on the network. Keywords: WSN, Black-hole attacks, multiple base stations & Check agent.