Behnam Ghahramankhani - Department of Computer Engineering, University of Science and Research Branch, Tehran, Iran
Akram Amiri - Department of Electrical Engineering, University of Zanjan, Zanjan, Iran

Wireless Sensor Networks have many applications in environment, military operations, discoveries, Supervisory operations. Increasing the use of WSNs in various application programs Such as hostile, supervisory and unavailable environments makes sure the users of network security and performance. In fact, security is a necessary condition for proper performance of network and without it, there is no guaranty to do these actions properly. In this paper, security in WSNs, attacks in these networks and defensive operations against these attacks are examined

WSNs, security, security factors, security threats