Wireless Sensor Network (WSN) utilizes small sensors with constrained properties to broadcast, collect, and sense the data in numerous applications. As WSN is an interest gaining technology. Security challenges become the main issue, especially in task like mission critical application. In this article, we identify the security attacks in WSN and identify the major solution for these attacks. These attacks are of three major categories; service integrity and network availability, privacy and confidentiality, and the integrity of data and major solution for these attacks. In addition, we also explain the methods and techniques used in these categories for the defense purposes and summarize the open research issues in these areas.
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