Abstract: Wireless Sensor Network is a rising innovation. Wireless sensor networks are more reasonable and capable comprise of bits generally called sensor nodes. One of the real challenges wireless sensor system confront today is security. Security has transformed into a major issues in WSN's since they are effortlessly vulnerable to a greater number of attacks than wired networks, so there's the need for successful security mechanism. This paper thinks about the security attacks, security related issues and challenges in wireless sensor system are examined . Moreover, we give a brief dialog on the not so distant future examination course in wireless sensor system.

Keywords: WSN, routing protocols, challenges, security.